{"id":23,"date":"2026-06-29T12:05:55","date_gmt":"2026-06-29T04:05:55","guid":{"rendered":"https:\/\/sdic-tcca.hbkaixuan.cn\/?p=23"},"modified":"2026-06-29T12:05:55","modified_gmt":"2026-06-29T04:05:55","slug":"sdic-dosage-for-shrimp-and-fish-ponds-a-complete-aquaculture-disinfection-guide-2026","status":"publish","type":"post","link":"https:\/\/sdic-tcca.hbkaixuan.cn\/?p=23","title":{"rendered":"SDIC Dosage for Shrimp and Fish Ponds: A Complete Aquaculture Disinfection Guide (2026)"},"content":{"rendered":"<p><strong>Quick answer:<\/strong> For routine aquaculture pond disinfection, dose <strong>0.5\u20131.0 ppm Sodium Dichloroisocyanurate (SDIC) 60%<\/strong> as a preventive measure every 7\u201310 days. For pre-stocking pond sterilization, use <strong>30\u201350 ppm SDIC<\/strong> with 48-hour retention before introducing aquatic species. During disease outbreaks (white spot, vibriosis), shock-dose at <strong>5\u201310 ppm SDIC<\/strong>. Always test pH (target 7.5\u20138.5) and ensure proper aeration before and after dosing.<\/p>\n<p>Sodium Dichloroisocyanurate (SDIC) is the most widely used chlorine donor in modern aquaculture because of its neutral pH after dissolution, broad-spectrum biocidal action, and rapid degradation that leaves no harmful residue. This guide compiles the dosing practices used by <strong>Shilan Chemical<\/strong>&#8216;s technical team across shrimp, fish, and crustacean farms in Southeast Asia, Latin America, and Africa.<\/p>\n<h2>Why SDIC Outperforms Other Chemical Choices in Aquaculture<\/h2>\n<p>Aquaculture operators have three primary chlorine choices: calcium hypochlorite, sodium hypochlorite (liquid bleach), and SDIC. SDIC dominates modern best practice because:<\/p>\n<ul>\n<li><strong>Neutral pH dissolution (6.0\u20137.0):<\/strong> Does not shock the pond&#8217;s existing alkalinity buffer, preserving the microbial balance critical for healthy growth<\/li>\n<li><strong>Stable solid form:<\/strong> Easy to ship, store on-farm, and dose precisely \u2014 no leaks, no concentration loss over storage time<\/li>\n<li><strong>56\u201360% available chlorine:<\/strong> Significantly higher than calcium hypochlorite (65\u201370% in theory, but unstable in practice), with predictable release rates<\/li>\n<li><strong>Zero residual heavy metals:<\/strong> Unlike calcium hypochlorite which leaves calcium scale and trace heavy metals, SDIC fully degrades into harmless components<\/li>\n<li><strong>Compliance friendly:<\/strong> Approved for aquaculture use under FAO, FDA, and EU EFSA guidelines when applied within recommended limits<\/li>\n<\/ul>\n<h2>Core SDIC Dosing Formula for Aquaculture Ponds<\/h2>\n<blockquote><p>\n<strong>SDIC Required (kg) = Pond Volume (m\u00b3) \u00d7 Target Chlorine (ppm) \u00f7 Active Chlorine % \u00f7 1,000<\/strong>\n<\/p><\/blockquote>\n<h3>Example Calculation<\/h3>\n<p>For a 1,000 m\u00b3 shrimp pond requiring 1 ppm preventive treatment with SDIC 60%:<br \/>\n<code>1,000 \u00d7 1 \u00f7 60 \u00d7 100 \u00f7 1,000 = 1.67 kg of SDIC 60%<\/code><\/p>\n<h2>Ready-to-Use Dosing Tables<\/h2>\n<h3>Routine Preventive Treatment (Every 7\u201310 Days)<\/h3>\n<table>\n<thead>\n<tr>\n<th>Pond Size<\/th>\n<th>SDIC 56% (kg)<\/th>\n<th>SDIC 60% (kg)<\/th>\n<th>Target Free Chlorine<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>500 m\u00b3<\/td>\n<td>0.9<\/td>\n<td>0.83<\/td>\n<td>1.0 ppm<\/td>\n<\/tr>\n<tr>\n<td>1,000 m\u00b3<\/td>\n<td>1.8<\/td>\n<td>1.67<\/td>\n<td>1.0 ppm<\/td>\n<\/tr>\n<tr>\n<td>5,000 m\u00b3<\/td>\n<td>8.9<\/td>\n<td>8.33<\/td>\n<td>1.0 ppm<\/td>\n<\/tr>\n<tr>\n<td>10,000 m\u00b3<\/td>\n<td>17.9<\/td>\n<td>16.7<\/td>\n<td>1.0 ppm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Pre-Stocking Pond Sterilization (Empty Pond, 48-hour Retention)<\/h3>\n<table>\n<thead>\n<tr>\n<th>Pond Size<\/th>\n<th>SDIC 60% Dose<\/th>\n<th>Wait Time Before Stocking<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>500 m\u00b3<\/td>\n<td>25 kg<\/td>\n<td>48 hours min, 72 hours preferred<\/td>\n<\/tr>\n<tr>\n<td>1,000 m\u00b3<\/td>\n<td>50 kg<\/td>\n<td>48 hours min, 72 hours preferred<\/td>\n<\/tr>\n<tr>\n<td>5,000 m\u00b3<\/td>\n<td>250 kg<\/td>\n<td>48 hours min, 72 hours preferred<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Emergency Outbreak Response (Stocked Pond \u2014 Use With Caution)<\/h3>\n<table>\n<thead>\n<tr>\n<th>Pond Size<\/th>\n<th>SDIC 60% Shock Dose<\/th>\n<th>Critical Precautions<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>500 m\u00b3<\/td>\n<td>4.2 kg (5 ppm)<\/td>\n<td>Continuous heavy aeration, harvest within 14 days if dose exceeds 8 ppm<\/td>\n<\/tr>\n<tr>\n<td>1,000 m\u00b3<\/td>\n<td>8.3 kg (5 ppm)<\/td>\n<td>Same as above<\/td>\n<\/tr>\n<tr>\n<td>5,000 m\u00b3<\/td>\n<td>41.7 kg (5 ppm)<\/td>\n<td>Same; consider partial water exchange before dosing<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Application Procedure: 7 Steps for Maximum Safety<\/h2>\n<ol>\n<li><strong>Measure pond volume accurately<\/strong> using surface area \u00d7 average depth. Errors of \u00b120% are common and dangerous<\/li>\n<li><strong>Test water parameters first:<\/strong> pH, dissolved oxygen, ammonia, temperature<\/li>\n<li><strong>Pre-dissolve SDIC<\/strong> in a separate container with 20\u00d7 volume of pond water; stir for 2 minutes<\/li>\n<li><strong>Apply during cooler hours<\/strong> (early morning or late evening) to avoid stressing stocked species<\/li>\n<li><strong>Distribute evenly<\/strong> across pond surface using a boat or shore-based broadcast for ponds &gt;500 m\u00b2<\/li>\n<li><strong>Run aerators continuously<\/strong> for at least 6 hours after dosing<\/li>\n<li><strong>Re-test free chlorine after 30 min<\/strong> to confirm target ppm reached<\/li>\n<\/ol>\n<h2>Common Dosing Mistakes That Kill Shrimp<\/h2>\n<h3>Mistake 1: Over-dosing in Hot Weather<\/h3>\n<p>Higher water temperature accelerates chlorine reaction, meaning the same dose delivers higher peak chlorine. Reduce dose by 20% when water exceeds 30\u00b0C.<\/p>\n<h3>Mistake 2: Skipping Aeration<\/h3>\n<p>SDIC consumes dissolved oxygen during disinfection. Without continuous aeration, oxygen drops below 3 ppm within hours, suffocating stocked species.<\/p>\n<h3>Mistake 3: Dosing During Algae Bloom Crashes<\/h3>\n<p>Decaying algae already strip oxygen. Adding SDIC accelerates the crash. Always do partial water exchange first.<\/p>\n<h3>Mistake 4: Mixing SDIC With Other Treatments<\/h3>\n<p>Never combine SDIC with formalin, potassium permanganate, or ammonia-based products. Wait 48 hours between treatments.<\/p>\n<h2>Pond-Type Specific Recommendations<\/h2>\n<h3>For Shrimp Ponds (Pacific White Shrimp, Black Tiger)<\/h3>\n<p>Pre-stocking: 30\u201350 ppm SDIC, 72-hour retention before PL stocking. Grow-out cycle: 0.5\u20131.0 ppm weekly with PCR-based vibrio screening.<\/p>\n<h3>For Tilapia and Carp Fingerling Ponds<\/h3>\n<p>Pre-stocking: 20\u201330 ppm SDIC. During grow-out: 0.3\u20130.5 ppm bi-weekly. Tilapia is moderately chlorine-sensitive \u2014 never exceed 1 ppm in stocked ponds.<\/p>\n<h3>For Prawn (Macrobrachium) Hatcheries<\/h3>\n<p>SDIC 60% effervescent tablets at 0.2 ppm in larval tanks. Critical: aerate continuously and maintain pH 7.8\u20138.2.<\/p>\n<h2>FAQ<\/h2>\n<h3>Can I use SDIC daily in stocked aquaculture ponds?<\/h3>\n<p>No. Daily dosing eliminates beneficial nitrifying bacteria. Use SDIC only weekly for prevention or for emergency outbreak response.<\/p>\n<h3>How long does SDIC stay active in pond water?<\/h3>\n<p>In tropical conditions (28\u201332\u00b0C), free chlorine from SDIC degrades to safe levels within 6\u201312 hours. In cooler temperate water, residual chlorine may persist up to 24 hours.<\/p>\n<h3>Will SDIC harm beneficial probiotic bacteria I&#8217;ve added?<\/h3>\n<p>Yes, SDIC kills both pathogens and probiotics. Re-inoculate beneficial bacteria 48 hours after SDIC treatment, once free chlorine drops below 0.1 ppm.<\/p>\n<h3>What is the harvest withdrawal period after SDIC treatment?<\/h3>\n<p>For routine 1 ppm preventive dosing, no withdrawal is required because residue is undetectable within 24 hours. For shock doses above 5 ppm, observe a 14-day withdrawal before harvest.<\/p>\n<h2>Sourcing Aquaculture-Grade SDIC<\/h2>\n<p><strong>Shilan Chemical<\/strong> supplies Veterinary GMP-certified SDIC 60% specifically formulated for aquaculture use, with batch-specific COA confirming heavy metal levels below FDA limits. We export to shrimp farms across Vietnam, Ecuador, India, Indonesia, and Bangladesh. <a href=\"https:\/\/sdic-tcca.hbkaixuan.cn\/contact.html\">Contact our aquaculture specialist team<\/a> for bulk pricing or sample requests.<\/p>\n<h2>Related Reading<\/h2>\n<ul>\n<li><a href=\"https:\/\/sdic-tcca.hbkaixuan.cn\/?p=6\">SDIC: Fast-Dissolving Chlorine Donor (Full Specifications)<\/a><\/li>\n<li><a href=\"https:\/\/sdic-tcca.hbkaixuan.cn\/?p=11\">Top 7 Industries Using TCCA and SDIC<\/a><\/li>\n<li><a href=\"https:\/\/sdic-tcca.hbkaixuan.cn\/solutions.html\">Application Solutions Catalog<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Step-by-step guide on using Sodium Dichloroisocyanurate (SDIC) for aquaculture pond disinfection. Exact dosing tables for shrimp, tilapia, and prawn farms, plus pre-stocking sterilization protocols and water-quality precautions.<\/p>\n","protected":false},"author":1,"featured_media":26,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-23","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/sdic-tcca.hbkaixuan.cn\/index.php?rest_route=\/wp\/v2\/posts\/23","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sdic-tcca.hbkaixuan.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sdic-tcca.hbkaixuan.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sdic-tcca.hbkaixuan.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sdic-tcca.hbkaixuan.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=23"}],"version-history":[{"count":0,"href":"https:\/\/sdic-tcca.hbkaixuan.cn\/index.php?rest_route=\/wp\/v2\/posts\/23\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sdic-tcca.hbkaixuan.cn\/index.php?rest_route=\/wp\/v2\/media\/26"}],"wp:attachment":[{"href":"https:\/\/sdic-tcca.hbkaixuan.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=23"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sdic-tcca.hbkaixuan.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=23"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sdic-tcca.hbkaixuan.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=23"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}