{"product_id":"icecap-dual-di-filter-canister-ro-di-polishing","title":"IceCap Dual DI Filter Canister | Inline Polishing DI for RO\/DI Water","description":"\u003cdiv class=\"sectionContent\"\u003e\n  \u003cp\u003eThe IceCap Dual DI Filter Canister is an inline \u003cstrong\u003edual-chamber deionization\u003c\/strong\u003e housing designed to polish RO water down to a true 0 TDS — the standard for pristine reef tanks, sensitive freshwater shrimp setups, and planted aquariums. Two DI cartridges in series mean the first stage takes the bulk of the load while the second stage acts as a final polisher, dramatically extending the life of your DI resin and giving you a more reliable 0 TDS reading at the outlet.\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eHeads up — Overweight Item:\u003c\/strong\u003e Due to size and weight, this item is not eligible for our free shipping program. Standard shipping rates apply at checkout. Local pickup is always free at our Lawrenceville GA store if you'd rather skip the shipping.\u003c\/p\u003e\n  \u003cp\u003eLooking for more water care? Browse our \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/filter-media-cartridges\" target=\"_blank\"\u003eFilter Media \u0026amp; Cartridges\u003c\/a\u003e, \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/maintenance-water-care\" target=\"_blank\"\u003eMaintenance \u0026amp; Water Care\u003c\/a\u003e, and \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/water-testing\" target=\"_blank\"\u003eWater Testing Kits\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sectionTitle\"\u003eFeatures\u003c\/div\u003e\n\u003cdiv class=\"sectionContent\"\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDual-stage DI\u003c\/strong\u003e — two chambers in series for longer resin life and more reliable 0 TDS output\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRefillable\u003c\/strong\u003e — reload with bulk DI resin (color-changing or mixed-bed) when exhausted\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eStandard fittings\u003c\/strong\u003e — integrates with most RO\/DI systems with quick-connect or threaded inputs\/outputs\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWall-mount friendly\u003c\/strong\u003e — compact, durable housing for under-sink or utility-room installs\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSuitable for both freshwater and saltwater\u003c\/strong\u003e — anywhere you need ultra-low TDS top-off or makeup water\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sectionTitle\"\u003eInstallation \u0026amp; Usage\u003c\/div\u003e\n\u003cdiv class=\"sectionContent\"\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWhere it goes:\u003c\/strong\u003e After your RO membrane, before the storage tank or float valve. Water flows in → first DI chamber → second DI chamber → out to your reservoir.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eResin loading:\u003c\/strong\u003e Use color-changing mixed-bed DI resin (or a separate cation\/anion stack) so you can visually see when each chamber is exhausted.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eReplace timing:\u003c\/strong\u003e When the first chamber's resin has changed color completely, swap it for fresh resin and rotate the second chamber forward — the polishing chamber typically lasts 2–3x longer than the first.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTDS check:\u003c\/strong\u003e Keep a TDS meter inline at the outlet — anything \u0026gt; 0 means the second-stage resin is starting to break through and needs attention.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInitial flush:\u003c\/strong\u003e When loading new resin, run a few gallons through and discard before using for top-off; this clears any fines or air pockets.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sectionTitle\"\u003eSpecifications\u003c\/div\u003e\n\u003cdiv class=\"sectionContent\"\u003e\n  \u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003eIceCap\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003eDual DI Filter Canister\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003eInline dual-chamber DI housing (refillable)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eUse For\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003ePolishing RO water to 0 TDS for reef, planted, and shrimp aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eSuitable For\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003eFreshwater \u0026amp; Saltwater (anywhere ultra-low TDS is needed)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eRefillable\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003eYes — uses standard DI resin\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eShipping\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003eOverweight — not eligible for free shipping; standard rates apply\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ddd;\"\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sectionTitle\"\u003eRecommended Pairings\u003c\/div\u003e\n\u003cdiv class=\"sectionContent\"\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/filter-media-cartridges\"\u003eDI resin \u0026amp; replacement cartridges\u003c\/a\u003e — keep spares so you never miss a top-off\u003c\/li\u003e\n    \u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/water-testing\"\u003eTDS meters \u0026amp; water testing\u003c\/a\u003e — verify 0 TDS at the outlet\u003c\/li\u003e\n    \u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/salt-mixes\"\u003eReef salt mixes\u003c\/a\u003e — pair with clean RO\/DI for stable salinity\u003c\/li\u003e\n    \u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/maintenance-water-care\"\u003eMaintenance \u0026amp; water care\u003c\/a\u003e — water conditioners, buffers, and additives\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sectionTitle\"\u003eFAQ\u003c\/div\u003e\n\u003cdiv class=\"sectionContent\"\u003e\n  \u003cp\u003e\u003cstrong\u003eWhy a dual DI vs. a single DI?\u003c\/strong\u003e\u003cbr\u003eTwo chambers in series means the first stage absorbs the bulk of the ions, while the second polishes anything that breaks through. You get longer resin life overall and a more reliable 0 TDS reading because there's always a \"fresh\" polishing chamber on the back end.\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eWhat resin should I use?\u003c\/strong\u003e\u003cbr\u003eA color-changing mixed-bed DI resin is the easiest — you can see at a glance when it's exhausted. Some hobbyists run separate cation and anion resin in each chamber for even longer life.\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eHow often do I replace the resin?\u003c\/strong\u003e\u003cbr\u003eIt depends on your source water TDS, RO membrane efficiency, and water usage. With color-changing resin you'll see when the first chamber turns; rotate the polishing chamber forward and reload the empty one.\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eDoes this qualify for free shipping?\u003c\/strong\u003e\u003cbr\u003eNo — due to size and weight this item is excluded from our free shipping program. Standard shipping rates apply at checkout. If you're local, in-store pickup at our Lawrenceville GA location is free.\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eWill it work with my existing RO\/DI system?\u003c\/strong\u003e\u003cbr\u003eMost likely yes — IceCap canisters use standard fittings. Check your system's tubing size (typically 1\/4\" or 3\/8\") and make sure your inputs\/outputs match.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"IceCap","offers":[{"title":"Default Title","offer_id":48637289660635,"sku":"IC-DFC200","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/icecap_dualdicanister.jpg?v=1776870231","url":"https:\/\/squeakysaquatics.com\/products\/icecap-dual-di-filter-canister-ro-di-polishing","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}