{"title":"Water \u0026 Salt","description":"RODI filters, salt mix, hydrometers and water change tools for perfect reef water.","products":[{"product_id":"200gpd-rodi-filter","title":"200 GPD RODI Filter","description":"\u003cp\u003eProduce crystal-clear, zero-TDS water fast with this high-output 200 GPD RODI system. Designed for reef keepers who demand purity, it removes chlorine, chloramines, heavy metals, silicates, nitrates, and other contaminants that fuel algae and stress corals. Perfect for mixing saltwater and topping off after tank evaporation.\u003c\/p\u003e\n\u003ch3\u003eWhat's in each stage\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eStage 1 – PP Sediment Filter:\u003c\/strong\u003e polypropylene prefilter catches sand, silt, and rust before they can clog the rest of the system, extending the life of every stage downstream.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStage 2 – CTO Carbon Block:\u003c\/strong\u003e activated carbon strips chlorine, chloramines, and organic compounds from your tap water — the stuff that destroys RO membranes and fuels algae blooms.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStages 3 \u0026amp; 4 – Dual 100 GPD RO Membranes:\u003c\/strong\u003e two high-rejection reverse osmosis membranes working in a water-saver configuration. Together they produce up to 200 gallons per day while sending less water down the drain than a single-membrane unit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStage 5 – Mixed-Bed DI Resin:\u003c\/strong\u003e the final polish. Color-changing DI resin grabs the last remaining ions so your TDS meter reads a true zero.\u003c\/p\u003e\n\u003ch3\u003eReady to run out of the box\u003c\/h3\u003e\n\u003cp\u003eShips preassembled with shutoff and flush valves installed — no plumbing puzzle on arrival. The flush valve lets you rinse the membranes before each run for longer membrane life, and the shutoff valve stops flow instantly when your reservoir is full.\u003c\/p\u003e\n\u003ch3\u003eWhy make your own water?\u003c\/h3\u003e\n\u003cp\u003eStore-bought “purified” water is inconsistent, and hauling jugs gets old fast. A home RODI system pays for itself in months and gives you complete control over the single most important ingredient in your reef tank.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e0 TDS guarantee:\u003c\/strong\u003e if your unit doesn't read zero TDS out of the box, send it back for a full refund.\u003c\/p\u003e","brand":"Sea Cardinal","offers":[{"title":"Default Title","offer_id":46719794053289,"sku":null,"price":194.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/5260\/1513\/files\/RODI_Unit.png?v=1769786259"},{"product_id":"hydrometer-for-salinity-testing","title":"Hydrometer for Salinity Testing","description":"\u003cul class=\"a-unordered-list a-vertical a-spacing-mini\"\u003e\n\u003cli class=\"a-spacing-mini\"\u003e\u003cspan class=\"a-list-item\"\u003e\u003cspan\u003e \u003c\/span\u003eMeasure both Temperature and Specific Gravity of the water.\u003cbr\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"a-spacing-mini\"\u003e\u003cspan class=\"a-list-item\"\u003eThe green indicators are for ideal range of water temperature and specific gravity for most salt water \/ marine aquariums.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"a-spacing-mini\"\u003e\u003cspan class=\"a-list-item\"\u003eDirections: Place the hydrometer into water, and let it flow freely in the water; If water level is below the green indicator means more for fresh water is required; If water level is above the green indicator means more salt or saltwater water is required.\u003cbr\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"a-spacing-mini\"\u003e\u003cspan class=\"a-list-item\"\u003e10\" Length x .75\" Width\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sea Cardinal","offers":[{"title":"Default Title","offer_id":46736248963241,"sku":null,"price":11.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/5260\/1513\/files\/ac1bf87609293300307f0f44a1caa66f.jpg?v=1767931024"},{"product_id":"salt-mix","title":"Professional Reef Salt Mix","description":"\u003cp\u003e\u003c!--StartFragment --\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSea Cardinal Premium Synthetic Salt Mix\u003c\/strong\u003e delivers laboratory‑grade consistency for reefers who demand absolute purity. Each batch is engineered to dissolve fast, mix crystal‑clear, and produce stable parameters that mirror premium seawater—without impurities, clouding, or unwanted swings. Balanced levels of calcium, alkalinity, and magnesium support strong coral growth, vibrant coloration, and long‑term tank stability. Whether you’re filling a new system or preparing weekly water changes, this mix gives your reef the clean foundation it deserves.\u003c\/p\u003e\n\u003cp\u003e\u003c!--EndFragment --\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch3\u003eTRITON ICP-OES Lab Results\u003c\/h3\u003e\n\u003cp\u003eIndependent lab test of this salt mix at 35 ppt salinity — tested March 2026.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eMeasured\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCalcium (Ca)\u003c\/td\u003e\n\u003ctd\u003e430 mg\/l\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnesium (Mg)\u003c\/td\u003e\n\u003ctd\u003e1436 mg\/l\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePotassium (K)\u003c\/td\u003e\n\u003ctd\u003e414 mg\/l\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStrontium (Sr)\u003c\/td\u003e\n\u003ctd\u003e9 mg\/l\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eHeavy metals:\u003c\/strong\u003e all tested heavy metals (Cu, Pb, Hg, Cd, As) measured 0.00 µg\/l — none detected.\u003c\/p\u003e","brand":"Sea Cardinal","offers":[{"title":"Sample 2.7 lbs 10 Gallons","offer_id":51408002023593,"sku":null,"price":10.0,"currency_code":"USD","in_stock":true},{"title":"14.5LBS 53 Gallons","offer_id":51408002056361,"sku":null,"price":23.99,"currency_code":"USD","in_stock":true},{"title":"44LBS 160 Gallons","offer_id":51408002089129,"sku":null,"price":64.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/5260\/1513\/files\/Salt_Test_1.jpg?v=1774432923"},{"product_id":"200-gpd-rodi-filter-replacements","title":"200 GPD RODI Filter Replacements","description":"\u003cp\u003eEverything you need to refresh your 200 GPD RODI system in one kit:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2 × 100 GPD RO membranes\u003c\/strong\u003e — the workhorses; replace every 2–3 years depending on your tap water\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1L mixed-bed DI resin\u003c\/strong\u003e — replace when your TDS meter reads above zero\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 × CTO carbon block\u003c\/strong\u003e — replace every 6–12 months\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 × PP sediment filter\u003c\/strong\u003e — replace every 6–12 months, or when you see visible discoloration\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eKeeping up with filter changes is what keeps your water at zero TDS. If your tap water is high in sediment or chloramines, check the prefilters more often.\u003c\/p\u003e","brand":"Sea Cardinal","offers":[{"title":"Default Title","offer_id":47392856015017,"sku":null,"price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/5260\/1513\/files\/Replacement_filters.jpg?v=1787885951"},{"product_id":"gentlepour-water-change-helper","title":"GentlePour Water Change Diffuser","description":"\u003cp\u003eIntroducing the GentlePour Diffusion Dock — the last water‑addition tool you’ll ever need.  \u003cbr\u003eDesigned for aquarists who care about stability, clarity, and zero stress for their fish, this over‑engineered diffuser softens the flow of new water as you add it to your aquarium. No more blasting substrate, disturbing plants, or startling livestock.\u003c\/p\u003e\n\u003cp\u003eEach unit is 3D‑printed with a heavy‑duty, lifetime‑grade infill pattern that breaks incoming water into a gentle, even cascade. Whether you’re topping off, performing a water change, or adding treated water, the GentlePour Dock keeps everything calm and controlled.\u003c\/p\u003e\n\u003cp\u003eBuilt to withstand years of use, this diffuser is solid, durable, and crafted for real aquarists who want equipment that performs flawlessly every time.\u003c\/p\u003e\n\u003cp\u003eKey Features\u003cbr\u003eUltra‑Smooth Water Diffusion — prevents substrate disruption and livestock stress\u003c\/p\u003e\n\u003cp\u003eOver‑Engineered for Lifetime Use — thick, reinforced 3D‑printed structure\u003c\/p\u003e\n\u003cp\u003eProtects Plants \u0026amp; Aquascapes — ideal for planted tanks and delicate layouts\u003c\/p\u003e\n\u003cp\u003eReef‑Safe \u0026amp; Freshwater‑Safe — inert materials, no leaching\u003c\/p\u003e\n\u003cp\u003eHand‑crafted in the USA — printed and inspected by Sea Cardinal\u003c\/p\u003e\n\u003cp\u003ePerfect for freshwater, reef, planted tanks, AIO systems, and sumps\u003c\/p\u003e","brand":"Sea Cardinal","offers":[{"title":"Small (4x3in)","offer_id":50475414913193,"sku":null,"price":24.95,"currency_code":"USD","in_stock":true},{"title":"Large (7.5x5.5in)","offer_id":50475414945961,"sku":null,"price":35.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/5260\/1513\/files\/Untitled_design_15.png?v=1790263746"}],"url":"https:\/\/seacardinal.com\/collections\/water-salt.oembed","provider":"Sea Cardinal","version":"1.0","type":"link"}