{"id":30,"date":"2026-07-11T09:20:00","date_gmt":"2026-07-11T01:20:00","guid":{"rendered":"https:\/\/sdic-tcca.hbkaixuan.cn\/?p=30"},"modified":"2026-07-11T09:20:00","modified_gmt":"2026-07-11T01:20:00","slug":"sdic-vs-tcca-comparison-buyers-guide","status":"publish","type":"post","link":"https:\/\/sdic-tcca.hbkaixuan.cn\/?p=30","title":{"rendered":"SDIC vs TCCA: The Complete Buyer&#8217;s Guide for Water Treatment Chemicals in 2026"},"content":{"rendered":"<p><strong>Quick answer:<\/strong> If you need <em>fast<\/em> disinfection (drinking water, aquaculture, food processing) \u2192 choose <strong>SDIC<\/strong>. If you need <em>sustained<\/em> chlorine release for 3-7 days (swimming pools, cooling towers, large water bodies) \u2192 choose <strong>TCCA<\/strong>. Read on for the full breakdown that our team uses to advise 200+ international buyers each year.<\/p>\n<h2>1. What Are SDIC and TCCA?<\/h2>\n<p>SDIC (Sodium Dichloroisocyanurate, CAS 2893-78-9) and TCCA (Trichloroisocyanuric Acid, CAS 87-90-1) are both chlorinated cyanurate compounds \u2014 meaning they release hypochlorous acid (HOCl) into water in a stabilized way, protected from UV degradation by the cyanuric acid backbone. That is why they outperform simple bleach (sodium hypochlorite) in outdoor and long-cycle applications.<\/p>\n<h2>2. Side-by-Side Comparison Table<\/h2>\n<table>\n<thead>\n<tr>\n<th>Parameter<\/th>\n<th>SDIC<\/th>\n<th>TCCA<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Chemical Formula<\/td>\n<td>C3Cl2N3NaO3<\/td>\n<td>C3Cl3N3O3<\/td>\n<\/tr>\n<tr>\n<td>Available Chlorine<\/td>\n<td>56%-60%<\/td>\n<td>\u226590%<\/td>\n<\/tr>\n<tr>\n<td>Molecular Weight<\/td>\n<td>220.0 g\/mol<\/td>\n<td>232.4 g\/mol<\/td>\n<\/tr>\n<tr>\n<td>pH (1% solution)<\/td>\n<td>6.0-7.0 (neutral)<\/td>\n<td>2.7-3.5 (acidic)<\/td>\n<\/tr>\n<tr>\n<td>Dissolution Rate<\/td>\n<td>Fast (2-3 min at 25\u00b0C)<\/td>\n<td>Slow (30-60 min for 200g tablet)<\/td>\n<\/tr>\n<tr>\n<td>Release Duration<\/td>\n<td>Immediate<\/td>\n<td>Sustained 5-7 days<\/td>\n<\/tr>\n<tr>\n<td>Shelf Life<\/td>\n<td>3 years<\/td>\n<td>2 years<\/td>\n<\/tr>\n<tr>\n<td>Bulk Density<\/td>\n<td>0.9-1.0 g\/ml<\/td>\n<td>0.8-0.95 g\/ml<\/td>\n<\/tr>\n<tr>\n<td>Solubility (water)<\/td>\n<td>25% at 25\u00b0C<\/td>\n<td>1.2% at 25\u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Typical Ex-Works Price<\/td>\n<td>US$1.05-1.35\/kg<\/td>\n<td>US$1.35-1.75\/kg<\/td>\n<\/tr>\n<tr>\n<td>Cost per kg Active Chlorine<\/td>\n<td>US$1.83-2.25<\/td>\n<td>US$1.50-1.94<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><em>Prices reflect 2026 Q3 China ex-works FCL rates. Contact us for updated quotations.<\/em><\/p>\n<h2>3. Which One Should You Buy?<\/h2>\n<h3>Choose SDIC when:<\/h3>\n<ul>\n<li>You need <strong>rapid disinfection<\/strong> (drinking water treatment, aquaculture, food processing lines)<\/li>\n<li>You prefer <strong>neutral pH<\/strong> to avoid corroding stainless equipment<\/li>\n<li>You dose manually and cannot wait for slow-release tablets<\/li>\n<li>You need <strong>NSF\/ANSI 60<\/strong>-listed products for potable water<\/li>\n<\/ul>\n<h3>Choose TCCA when:<\/h3>\n<ul>\n<li>You want <strong>long-cycle disinfection<\/strong> (5-7 days per tablet in swimming pools)<\/li>\n<li>You need the <strong>highest chlorine per kg<\/strong> (90% vs 60%) for shipping efficiency<\/li>\n<li>Your dosing is <strong>automatic<\/strong> (feeders, floating dispensers)<\/li>\n<li>You are OK with slightly acidic pH (which suits pool water balance)<\/li>\n<\/ul>\n<h2>4. FAQ from B2B Buyers<\/h2>\n<p><strong>Q1: Can I use SDIC and TCCA interchangeably?<\/strong><br \/>\nA: No. TCCA&#8217;s slow release means it under-dosages fast-consumption water. SDIC&#8217;s neutral pH means it over-shocks pools with delicate pH balance. Match the chemistry to the application.<\/p>\n<p><strong>Q2: Which one is cheaper for the same disinfection effect?<\/strong><br \/>\nA: TCCA gives you ~25% more available chlorine per USD when calculated correctly (see table). But TCCA is only cheaper when you can use its slow-release characteristic \u2014 otherwise you waste chlorine.<\/p>\n<p><strong>Q3: How do I know I am getting real 90% TCCA and not 85% adulterated?<\/strong><br \/>\nA: Request an SGS or Intertek pre-shipment inspection. Shilan provides third-party COA on every shipment, plus retention samples for 24 months.<\/p>\n<h2>5. Common Mistakes We See From New Buyers<\/h2>\n<ol>\n<li><strong>Buying TCCA tablets for drinking water<\/strong> \u2014 slow release + acidic pH = wrong tool<\/li>\n<li><strong>Buying SDIC for outdoor pools without cyanuric acid backup<\/strong> \u2014 chlorine burns off in UV within hours<\/li>\n<li><strong>Overpaying for &#8220;90% pure&#8221; SDIC<\/strong> \u2014 the 60% ceiling is a chemistry limit, not a quality one<\/li>\n<li><strong>Storing in metal drums<\/strong> \u2014 corrodes containers and releases toxic chlorine gas; use HDPE only<\/li>\n<li><strong>Mixing SDIC and TCCA in the same feeder<\/strong> \u2014 pH conflict, potential explosive reaction<\/li>\n<\/ol>\n<h2>Ready to Order?<\/h2>\n<p>Shilan Chemical produces both SDIC and TCCA at ISO 9001 \/ NSF-listed facility in Hebei, China. MOQ 1 metric ton, samples available, 12-hour quote turnaround. <a href=\"https:\/\/sdic-tcca.hbkaixuan.cn\/contact.html\">Request a quote \u2192<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Confused between SDIC and TCCA? This complete guide compares dissolution rate, chlorine content, pH, storage life, cost per kg of active chlorine, and application fit \u2014 with a decision matrix used by 200+ B2B buyers.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-30","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/sdic-tcca.hbkaixuan.cn\/index.php?rest_route=\/wp\/v2\/posts\/30","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=30"}],"version-history":[{"count":0,"href":"https:\/\/sdic-tcca.hbkaixuan.cn\/index.php?rest_route=\/wp\/v2\/posts\/30\/revisions"}],"wp:attachment":[{"href":"https:\/\/sdic-tcca.hbkaixuan.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=30"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sdic-tcca.hbkaixuan.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=30"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sdic-tcca.hbkaixuan.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=30"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}