{"id":243687,"date":"2026-04-07T17:18:04","date_gmt":"2026-04-07T15:18:04","guid":{"rendered":"https:\/\/drain-master.de\/2026\/04\/07\/drain-ph-too-low-causes-solutions-for-cannabis\/"},"modified":"2026-05-22T08:47:17","modified_gmt":"2026-05-22T06:47:17","slug":"drain-ph-too-low-causes-solutions-for-cannabis","status":"publish","type":"post","link":"https:\/\/drain-master.de\/en\/2026\/04\/07\/drain-ph-too-low-causes-solutions-for-cannabis\/","title":{"rendered":"Low Drain pH &#8211; Causes &#038; Solutions for Cannabis"},"content":{"rendered":"<article>\n<p class=\"intro\">What 80% of growers misread about runoff.<\/p>\n<p>A  <strong>Low Drain pH<\/strong> is the classic warning sign that many growers overlook until leaves turn yellow and growth stagnates. You water with a perfectly adjusted pH of 6.5, but what comes out of the pot at the bottom only has a pH of 5.8 or even lower. This is not a measurement error, but a clear sign that your root zone is acidifying. If you ignore this problem, you risk massive nutrient problems and, in the worst case, ruin your entire harvest. In this guide, I\u2019ll show you why this happens and how to get it under control like a pro.    <\/p>\n<div class=\"woocommerce columns-1 \"><ul class=\"products columns-1\">\n<li class=\"product type-product post-2267 status-publish first instock product_cat-coaster product_cat-garden-supplies has-post-thumbnail taxable shipping-taxable purchasable product-type-simple\">\n\t<a href=\"https:\/\/drain-master.de\/en\/product\/drainmaster-drip-stand\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\"><div class=\"woocommerce-image__wrapper\"><a href=\"https:\/\/drain-master.de\/en\/product\/drainmaster-drip-stand\/\" title=\"DrainMaster incl. tub (Set size configurable)\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\"><div class=\"shoptimizer-plp-carousel-container\"><div class=\"shoptimizer-plp-image-wrapper\"><img fetchpriority=\"high\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/drain-master.de\/wp-content\/uploads\/2023\/04\/DrainMaster-Set_2-300x300.jpg\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"DrainMaster Single set\" srcset=\"https:\/\/drain-master.de\/wp-content\/uploads\/2023\/04\/DrainMaster-Set_2-300x300.jpg 300w, https:\/\/drain-master.de\/wp-content\/uploads\/2023\/04\/DrainMaster-Set_2-1019x1024.jpg 1019w, https:\/\/drain-master.de\/wp-content\/uploads\/2023\/04\/DrainMaster-Set_2-768x771.jpg 768w, https:\/\/drain-master.de\/wp-content\/uploads\/2023\/04\/DrainMaster-Set_2-1529x1536.jpg 1529w, https:\/\/drain-master.de\/wp-content\/uploads\/2023\/04\/DrainMaster-Set_2-990x994.jpg 990w, https:\/\/drain-master.de\/wp-content\/uploads\/2023\/04\/DrainMaster-Set_2-441x443.jpg 441w, https:\/\/drain-master.de\/wp-content\/uploads\/2023\/04\/DrainMaster-Set_2-100x100.jpg 100w, https:\/\/drain-master.de\/wp-content\/uploads\/2023\/04\/DrainMaster-Set_2-150x151.jpg 150w, https:\/\/drain-master.de\/wp-content\/uploads\/2023\/04\/DrainMaster-Set_2.jpg 1991w\" sizes=\"(max-width: 360px) 147px, (max-width: 300px) 100vw, 300px\" \/>\t\t\t\n\t<\/div><\/div><\/a><\/div><div class=\"woocommerce-card__header\">\t\t\t\t\t<p class=\"product__categories\"><a href=\"https:\/\/drain-master.de\/en\/product-category\/garden-supplies\/coaster\/\" rel=\"tag\">Coaster<\/a>, <a href=\"https:\/\/drain-master.de\/en\/product-category\/garden-supplies\/\" rel=\"tag\">Garden supplies<\/a><\/p>\t\t\t\t<div class=\"woocommerce-loop-product__title\"><a tabindex=\"0\" href=\"https:\/\/drain-master.de\/en\/product\/drainmaster-drip-stand\/\" aria-label=\"DrainMaster incl. tub (Set size configurable)\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">DrainMaster incl. tub (Set size configurable)<\/a><\/div><\/a><p class=\"price\"><span class=\"woocommerce-Price-amount amount\"><bdi>24,99\u00a0<span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span><\/bdi><\/span><\/p><\/a><a href=\"\/en\/wp-json\/wp\/v2\/posts\/243687?add-to-cart=2267\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_2267\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"2267\" data-product_sku=\"DM-01\" aria-label=\"Add to cart: \u201cDrainMaster incl. tub (Set size configurable)\u201d\" rel=\"nofollow\" data-success_message=\"\u201cDrainMaster incl. tub (Set size configurable)\u201d has been added to your cart\" role=\"button\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_2267\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t<input type=\"hidden\" class=\"pmwProductId\" data-id=\"2267\">\n\t\t\t\t\t<script data-cfasync=\"false\">\n\t\t\t(window.pmwDataLayer = window.pmwDataLayer || {}).products                = window.pmwDataLayer.products || {};\n\t\t\twindow.pmwDataLayer.products[2267] = {\"id\":\"2267\",\"sku\":\"DM-01\",\"price\":24.99,\"brand\":\"\",\"quantity\":1,\"dyn_r_ids\":{\"post_id\":\"2267\",\"sku\":\"DM-01\",\"gpf\":\"woocommerce_gpf_2267\",\"gla\":\"gla_2267\"},\"is_variable\":false,\"type\":\"simple\",\"name\":\"DrainMaster incl. tub (Set size configurable)\",\"category\":[\"Coaster\",\"Garden supplies\"],\"is_variation\":false};\n\t\t\t\t\twindow.pmw_product_position = window.pmw_product_position || 1;\n\t\twindow.pmwDataLayer.products[2267]['position'] = window.pmw_product_position++;\n\t\t\t\t<\/script>\n\t\t<\/div><\/li>\n<\/ul>\n<\/div>\n<h2>From Irrigation Water to Drain: Why pH Actively Drops<\/h2>\n<p>The fact that the pH in the drain is almost always lower than in the irrigation water is no reason to panic. It is the result of completely normal biological and chemical processes in the substrate. Think of it this way: your pot is not a passive container, but a living ecosystem. If you know the causes, you can control them.   <\/p>\n<h3>The Phenomenon Explained<\/h3>\n<p>The specific example \u2013 input 6.5, drain 5.8 \u2013 shows a drop of 0.7 points. A slight deviation of 0.2 to 0.5 is often normal and harmless. It becomes problematic when the difference increases or the drain value continuously drops further. This indicates an imbalance that must be actively corrected before visible damage occurs to the plant.   <\/p>\n<h3>The Invisible Workers in the Substrate<\/h3>\n<p>Three main factors are responsible for acidification in the root zone:<\/p>\n<ul>\n<li><strong>H\u207a-ion release by roots:<\/strong> To absorb nutrients like potassium (K\u207a), calcium (Ca\u00b2\u207a), and magnesium (Mg\u00b2\u207a), the plant performs what is called <a href=\"https:\/\/de.wikipedia.org\/wiki\/Kationenaustauschkapazit%C3%A4t\" target=\"_blank\" rel=\"noopener\">cation exchange<\/a>. It releases positively charged hydrogen ions (H\u207a) into the substrate to absorb positively charged nutrient ions in return. These H\u207a ions are, by definition, acid and directly lower the pH at the roots.  <\/li>\n<li><strong>Microbial activity:<\/strong> A healthy substrate is full of microorganisms. These decompose organic material (e.g., root residues, organic fertilizer components) and produce organic acids as a byproduct. This process also contributes to gradual acidification.  <\/li>\n<li><strong>The acidifying effect of fertilizers:<\/strong> Many mineral fertilizers, especially those with a high proportion of ammonium nitrogen (NH\u2084\u207a), have a strong acidifying effect. When the plant absorbs ammonium, it also releases H\u207a ions, which further lowers the pH in the substrate. Excessive use quickly leads to <strong>salt buildup in the substrate<\/strong>, which exacerbates the problem.  <\/li>\n<\/ul>\n<h2>Nutrient Lockout: The Consequences of an Overly Acidic Root Environment<\/h2>\n<p>Soil that is too acidic is like a full refrigerator with a stuck door for your plant. The nutrients are there, but the plant can no longer access them. This phenomenon is called nutrient lockout and is the direct consequence when your <strong>drain pH is too low<\/strong>. A stable and <a href=\"https:\/\/drain-master.de\/en\/2026\/04\/07\/optimal-cannabis-ph-value-the-guide-for-soil-coco-hydro\/\">optimal pH for cannabis<\/a> is therefore not an option, but a necessity.   <\/p>\n<h3>When the Plant Starves Despite Fertilizer<\/h3>\n<p>The core problem of lockout is that pH changes the chemical form of nutrients in the soil. Below a pH of about 6.0, essential macronutrients become increasingly unavailable to the plant. Many growers misinterpret deficiency symptoms, add more fertilizer, and only make things worse. They increase the EC value in the substrate, which further stresses the roots without solving the actual availability problem.   <\/p>\n<h3>Blocked Nutrients and Toxic Metals<\/h3>\n<p>A persistently acidic root zone has concrete and devastating effects:<\/p>\n<ul>\n<li><strong>Deficiency symptoms:<\/strong> Classic symptoms of <strong>cannabis nutrient deficiency<\/strong> caused by low pH include deficiencies in calcium (rusty brown spots), magnesium (yellowing between leaf veins), and phosphorus (slower growth, purple stems).<\/li>\n<li><strong>Risk of toxicity:<\/strong> While important nutrients are blocked, the availability of heavy metals like manganese and aluminum increases sharply. In excessively high concentrations, these are toxic, directly damage the roots, and lead to small, necrotic spots on the leaves. <\/li>\n<li><strong>Long-term root damage:<\/strong> An acidic environment attacks the fine root hairs responsible for nutrient uptake. The root system is weakened, the plant becomes more susceptible to diseases, and overall metabolism slows down. <\/li>\n<\/ul>\n<h2>Act Instead of React: Solutions for a Low Drain pH<\/h2>\n<p>The key to success lies in prevention. Those who set up their system stably from the start will less often need emergency measures later. But even if the problem has already occurred, there are clear steps for correction.  <\/p>\n<h3>Preventive Measures for a Stable Substrate<\/h3>\n<p>To prevent a drain pH that\u2019s too low from the start, ensure a solid foundation:<\/p>\n<ul>\n<li><strong>Substrate choice and buffering:<\/strong> Use high-quality soil and preventively mix 1-2 grams of dolomite lime per liter of substrate. Dolomite lime acts as a natural pH buffer, counteracting acidification and simultaneously providing calcium and magnesium. <\/li>\n<li><strong>Water quality and watering behavior:<\/strong> Know the carbonate hardness (KH) of your water. Soft water has low buffering capacity and is more prone to pH fluctuations. Here, adding Cal-Mag products like <a href=\"https:\/\/drain-master.de\/en\/product\/athena-balance-946-ml\/\">Athena Balance<\/a> can help stabilize the pH. Always water so that 10-20% of the irrigation volume runs out as drain. This \u201crunoff measurement\u201d flushes out excess salts and prevents accumulation.    <\/li>\n<\/ul>\n<h3>When and How to Correct<\/h3>\n<p>Accurate diagnosis is the first step to recovery. For this, you need a reliable measuring device like the <a href=\"https:\/\/drain-master.de\/en\/product\/apera-ph60-premium-ph-pocket-meter\/\">Apera PH60 Premium pH Pocket Tester<\/a>, which you regularly adjust with a <a href=\"https:\/\/drain-master.de\/en\/product\/ph-calibration-solution-set-4-01-7-00-3m-kcl-electrolyte-solution-250ml\/\">pH Calibration Solution Set<\/a>. <\/p>\n<ul>\n<li><strong>The \u201c0.5 \/ 1.0 \/ 1.5+\u201d Rule:<\/strong>\n<ul>\n<li><strong>Deviation < 0.5:<\/strong> Observe. This is often still within the normal range. <\/li>\n<li><strong>Deviation 0.5 \u2013 1.0:<\/strong> Act. Slightly increase the pH of your irrigation water next time (e.g., to 6.7-6.8) to gently counteract. <\/li>\n<li><strong>Deviation > 1.0:<\/strong> Emergency. Flushing is required here. <\/li>\n<\/ul>\n<\/li>\n<li><strong>The flushing method:<\/strong> If the <strong>drain pH is too low<\/strong> and the situation is acute, flush the pot with two to three times the pot volume of pH-corrected water (pH approx. 6.5). Measure the pH of the drain periodically to see how it normalizes. Since flushing also removes nutrients, the next watering should contain a light nutrient solution.  <\/li>\n<\/ul>\n<div class=\"woocommerce columns-1 \"><ul class=\"products columns-1\">\n<li class=\"product type-product post-92318 status-publish first instock product_cat-untersetzer product_cat-gartenbedarf has-post-thumbnail taxable shipping-taxable purchasable product-type-simple\">\n\t<a href=\"https:\/\/drain-master.de\/en\/product\/drainmaster-xl-single-set-incl-tub\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\"><div class=\"woocommerce-image__wrapper\"><a href=\"https:\/\/drain-master.de\/en\/product\/drainmaster-xl-single-set-incl-tub\/\" title=\"DrainMaster XL incl. Tub (Set Size Configurable)\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\"><div class=\"shoptimizer-plp-carousel-container\"><div class=\"shoptimizer-plp-image-wrapper\"><img decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/drain-master.de\/wp-content\/uploads\/2024\/12\/1-4-1-300x300.jpg\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"DrainMaster XL\" srcset=\"https:\/\/drain-master.de\/wp-content\/uploads\/2024\/12\/1-4-1-300x300.jpg 300w, https:\/\/drain-master.de\/wp-content\/uploads\/2024\/12\/1-4-1-600x600.jpg 600w, https:\/\/drain-master.de\/wp-content\/uploads\/2024\/12\/1-4-1-1024x1024.jpg 1024w, https:\/\/drain-master.de\/wp-content\/uploads\/2024\/12\/1-4-1-768x768.jpg 768w, https:\/\/drain-master.de\/wp-content\/uploads\/2024\/12\/1-4-1-1536x1536.jpg 1536w, https:\/\/drain-master.de\/wp-content\/uploads\/2024\/12\/1-4-1-990x990.jpg 990w, https:\/\/drain-master.de\/wp-content\/uploads\/2024\/12\/1-4-1-441x441.jpg 441w, https:\/\/drain-master.de\/wp-content\/uploads\/2024\/12\/1-4-1-100x100.jpg 100w, https:\/\/drain-master.de\/wp-content\/uploads\/2024\/12\/1-4-1-800x800.jpg 800w, https:\/\/drain-master.de\/wp-content\/uploads\/2024\/12\/1-4-1-150x150.jpg 150w, https:\/\/drain-master.de\/wp-content\/uploads\/2024\/12\/1-4-1.jpg 2000w\" sizes=\"(max-width: 360px) 147px, (max-width: 300px) 100vw, 300px\" \/>\t\t\t\n\t<\/div><\/div><\/a><\/div><div class=\"woocommerce-card__header\">\t\t\t\t\t<p class=\"product__categories\"><a href=\"https:\/\/drain-master.de\/produkt-kategorie\/gartenbedarf\/untersetzer\/\" rel=\"tag\">Untersetzer<\/a>, <a href=\"https:\/\/drain-master.de\/produkt-kategorie\/gartenbedarf\/\" rel=\"tag\">Gartenbedarf<\/a><\/p>\t\t\t\t<div class=\"woocommerce-loop-product__title\"><a tabindex=\"0\" href=\"https:\/\/drain-master.de\/en\/product\/drainmaster-xl-single-set-incl-tub\/\" aria-label=\"DrainMaster XL incl. Tub (Set Size Configurable)\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">DrainMaster XL incl. Tub (Set Size Configurable)<\/a><\/div><\/a><p class=\"price\"><span class=\"woocommerce-Price-amount amount\"><bdi>39,99\u00a0<span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span><\/bdi><\/span><\/p><\/a><a href=\"\/en\/wp-json\/wp\/v2\/posts\/243687?add-to-cart=92318\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_92318\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"92318\" data-product_sku=\"DM-01-XL\" aria-label=\"Add to cart: \u201cDrainMaster XL incl. Tub (Set Size Configurable)\u201d\" rel=\"nofollow\" data-success_message=\"\u201cDrainMaster XL incl. Tub (Set Size Configurable)\u201d has been added to your cart\" role=\"button\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_92318\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t<input type=\"hidden\" class=\"pmwProductId\" data-id=\"92318\">\n\t\t\t\t\t<script data-cfasync=\"false\">\n\t\t\t(window.pmwDataLayer = window.pmwDataLayer || {}).products                = window.pmwDataLayer.products || {};\n\t\t\twindow.pmwDataLayer.products[92318] = {\"id\":\"92318\",\"sku\":\"DM-01-XL\",\"price\":39.99,\"brand\":\"\",\"quantity\":1,\"dyn_r_ids\":{\"post_id\":\"92318\",\"sku\":\"DM-01-XL\",\"gpf\":\"woocommerce_gpf_92318\",\"gla\":\"gla_92318\"},\"is_variable\":false,\"type\":\"simple\",\"name\":\"DrainMaster XL incl. Tub (Set Size Configurable)\",\"category\":[\"Untersetzer\",\"Gartenbedarf\"],\"is_variation\":false};\n\t\t\t\t\twindow.pmw_product_position = window.pmw_product_position || 1;\n\t\twindow.pmwDataLayer.products[92318]['position'] = window.pmw_product_position++;\n\t\t\t\t<\/script>\n\t\t<\/div><\/li>\n<\/ul>\n<\/div>\n<h2>Keeping an Eye on the Trend: Smart pH Control for Healthy Plants<\/h2>\n<p>Experienced growers don\u2019t chase every single measurement. They understand that the trend is crucial. A single outlier is less concerning than a consistently falling pH over several waterings. If your <strong>drain pH is too low<\/strong> but remains stable at 5.9, it\u2019s often easier to manage than a value that drops from 6.2 to 5.9 and then to 5.7.   <\/p>\n<h3>Single Value vs. Trend<\/h3>\n<p>A stable, albeit slightly lower, value indicates that the system has found a balance. A continuously falling trend, however, is a clear alarm signal that the buffering capacity of the substrate is exhausted and acidification is occurring. Here you must intervene before deficiency symptoms become visible. Regular monitoring of <strong>EC value cannabis<\/strong> and <strong>pH value cannabis<\/strong> in the drain is essential to recognize these trends.   <\/p>\n<h3>Systematic Measurement and Control<\/h3>\n<p>Make it a habit to measure the <strong>drain EC value<\/strong> and the pH value at least twice a week. The practical implementation of how to <a href=\"https:\/\/drain-master.de\/en\/2023\/04\/27\/stress-free-measurement-ph-and-ec-values-without-raising-the-plant-pot\/\">measure pH and EC values stress-free<\/a> is crucial for consistency. Keep a logbook or use digital assistants. Instead of laboriously maintaining tables, the <strong>DrainMaster<\/strong>\u2014a mini drainage table made of ASA plastic like that used in the automotive industry, made in Germany with 100% green electricity and its own PV system\u2014can cleanly collect the drain in a transparent 1.5 L tray under the pot. You place your pH meter directly into the tray without lifting the pot and read the value in seconds. In combination with the free <strong>DrainMaster Plus App<\/strong> (iOS and Android, no subscription), the entire process is automated: the app visualizes the trends of your drain pH and EC values, so you can see at a glance whether your substrate is stable or if you need to take counter-measures. This is how you transform reactive problem-solving into proactive plant management.      <\/p>\n<figure style=\"margin: 2rem 0; text-align: center;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto; border-radius: 8px;\" src=\"https:\/\/drain-master.de\/wp-content\/uploads\/2026\/04\/infografik-7-scaled.webp\" alt=\"pH in Drain Continuously Dropping? - Infographic\"><\/figure>\n<h2>Frequently asked questions<\/h2>\n<details style=\"border: 1px solid #e5e7eb; border-radius: 8px; margin-bottom: 8px; overflow: hidden;\">\n<summary style=\"padding: 14px 18px; cursor: pointer; font-weight: 600; font-size: 1.05em; background: #fafafa; list-style: none;\">Why is the pH value in the drain always lower than the irrigation water pH?<\/summary>\n<p style=\"padding: 14px 18px; margin: 0; color: #555; line-height: 1.6; border-top: 1px solid #e5e7eb;\">This is a natural process caused by your plant\u2019s activity. When absorbing nutrients, the roots release acidic hydrogen ions (H\u207a) into the substrate, which lowers the pH value. Additionally, microorganisms in the soil and fertilizers containing ammonium contribute to acidification.  <\/p>\n<\/details>\n<details style=\"border: 1px solid #e5e7eb; border-radius: 8px; margin-bottom: 8px; overflow: hidden;\">\n<summary style=\"padding: 14px 18px; cursor: pointer; font-weight: 600; font-size: 1.05em; background: #fafafa; list-style: none;\">Is it normal for the pH value in the drain to continue dropping as the plant size increases?<\/summary>\n<p style=\"padding: 14px 18px; margin: 0; color: #555; line-height: 1.6; border-top: 1px solid #e5e7eb;\">Yes, that is typical and often a sign of a very active, healthy plant. A larger plant has a higher metabolism, absorbs more nutrients, and therefore releases more acidifying ions into the substrate. As long as the drop remains within a moderate range, it is a good sign of vigorous growth.  <\/p>\n<\/details>\n<details style=\"border: 1px solid #e5e7eb; border-radius: 8px; margin-bottom: 8px; overflow: hidden;\">\n<summary style=\"padding: 14px 18px; cursor: pointer; font-weight: 600; font-size: 1.05em; background: #fafafa; list-style: none;\">At what pH difference between irrigation water and drain should I start to worry?<\/summary>\n<p style=\"padding: 14px 18px; margin: 0; color: #555; line-height: 1.6; border-top: 1px solid #e5e7eb;\">A difference of up to 0.8 points is completely normal for healthy plants in soil. If the value drops by 1.0 point, you should monitor it and possibly slightly raise the pH of your irrigation water. With a deviation of 1.5 or more, active measures such as correcting the input or flushing the substrate are required to avoid nutrient lockouts.  <\/p>\n<\/details>\n<details style=\"border: 1px solid #e5e7eb; border-radius: 8px; margin-bottom: 8px; overflow: hidden;\">\n<summary style=\"padding: 14px 18px; cursor: pointer; font-weight: 600; font-size: 1.05em; background: #fafafa; list-style: none;\">What are the main reasons why the pH in the drain keeps getting lower?<\/summary>\n<p style=\"padding: 14px 18px; margin: 0; color: #555; line-height: 1.6; border-top: 1px solid #e5e7eb;\">The main causes are the release of hydrogen ions by the roots during nutrient uptake and the decomposition of organic material by microbes. If you also use mineral fertilizers with a high ammonium content (NH\u2084\u207a), this intensifies the effect. These combined biological and chemical processes cause the pH in the drain to drop steadily.  <\/p>\n<\/details>\n<details style=\"border: 1px solid #e5e7eb; border-radius: 8px; margin-bottom: 8px; overflow: hidden;\">\n<summary style=\"padding: 14px 18px; cursor: pointer; font-weight: 600; font-size: 1.05em; background: #fafafa; list-style: none;\">How can I correct a pH value in the drain that is falling too sharply?<\/summary>\n<p style=\"padding: 14px 18px; margin: 0; color: #555; line-height: 1.6; border-top: 1px solid #e5e7eb;\">If the pH value drops by more than 1.0 to 1.5 points, you should gradually raise the pH of your irrigation water to counteract it. In the case of a critically low value indicating salt buildup, targeted flushing of the substrate with pH-corrected water may be necessary. The phenomenon of \u201cpH in the drain getting lower?\u201d is therefore manageable if you react in time.  <\/p>\n<\/details>\n<details style=\"border: 1px solid #e5e7eb; border-radius: 8px; margin-bottom: 8px; overflow: hidden;\">\n<summary style=\"padding: 14px 18px; cursor: pointer; font-weight: 600; font-size: 1.05em; background: #fafafa; list-style: none;\">Does coconut substrate react differently to pH fluctuations than soil?<\/summary>\n<p style=\"padding: 14px 18px; margin: 0; color: #555; line-height: 1.6; border-top: 1px solid #e5e7eb;\">Yes, coco coir and other hydroponic substrates have a lower buffering capacity than soil. This means they cannot stabilize the pH value as well and react more quickly to changes caused by fertilizer or root activity. On coco, you therefore need to monitor the drain pH more closely, as it can move into a critical range faster.  <\/p>\n<\/details>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>What 80% of growers misread about runoff. A Low Drain pH is the classic warning sign that many growers overlook&hellip;<\/p>\n","protected":false},"author":1,"featured_media":243688,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rank_math_title":"Low Drain pH - Causes & Solutions for Cannabis","rank_math_description":"Is your drain pH too low and continuously dropping? Understand the chemistry in your substrate & when you need to act. 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