{"product_id":"api-calcium-test-kit-liquid-1-25oz-saltwater","title":"API Calcium Test Kit Liquid 1.25oz Saltwater","description":"\u003cp\u003e\u003cstrong\u003eKnow your calcium before your corals tell you the hard way.\u003c\/strong\u003e The API Calcium Test Kit measures calcium in saltwater and reef aquariums by liquid titration — the mineral stony corals, coralline algae, clams and other calcifying invertebrates draw down continuously to build skeleton and shell. A reading here tells you whether your dosing is keeping up with what the tank is actually consuming.\u003c\/p\u003e\n\n\u003ch3\u003eKey features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTitration method\u003c\/strong\u003e — count reagent drops rather than read a colour gradient, which gives a more precise result than a dip strip.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReads as low as 20 mg\/L\u003c\/strong\u003e — sensitive enough to catch calcium depletion well before it shows up as slowed coral growth.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSaltwater and reef specific\u003c\/strong\u003e — calibrated for the 400–500 ppm range a reef tank actually runs in, not a freshwater range that doesn't apply.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimple kit, no equipment\u003c\/strong\u003e — test tube, two reagent bottles and a colour-matched instruction card.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003ctd\u003eLiquid titration test kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMeasures\u003c\/th\u003e\n\u003ctd\u003eCalcium (Ca)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWater type\u003c\/th\u003e\n\u003ctd\u003eSaltwater \/ reef\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRange\u003c\/th\u003e\n\u003ctd\u003eReadable to 20 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTarget reef range\u003c\/th\u003e\n\u003ctd\u003e400–500 ppm (mg\/L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWhat's included\u003c\/th\u003e\n\u003ctd\u003e2 reagent bottles, 1 capped test tube, colour-matched instructions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended testing frequency\u003c\/th\u003e\n\u003ctd\u003eWeekly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cp\u003eFill the test tube to the marked line with tank water, add the first reagent, then add the second reagent one drop at a time, swirling and counting until the colour changes. Each drop typically represents a fixed increment of calcium concentration — follow the conversion on the included card, since API does not publish a universal drops-to-ppm multiplier that applies across all its titration kits.\u003c\/p\u003e\n\n\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eSuitable for:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eReef tanks with stony corals, soft corals, clams and coralline algae\u003c\/li\u003e\n\u003cli\u003eFish-only saltwater systems where you also dose calcium for pH stability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFreshwater aquariums — this kit is formulated and calibrated for saltwater\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eGoes well with\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/api-copper-test-kit-liquid-1-25oz-fresh-saltwater\"\u003eAPI Copper Test Kit\u003c\/a\u003e — copper is lethal to the same invertebrates that depend on stable calcium.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/api-deluxe-ph-test-kit-with-liquid-adjusters\"\u003eAPI Deluxe pH Test Kit with Liquid Adjusters\u003c\/a\u003e — calcium and pH interact; a full picture needs both.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\n\u003cp\u003eThis is a consumable test kit, so no manufacturer warranty period applies. This does not affect your rights under the Australian Consumer Law: if the product is faulty, unsafe or not as described, you are entitled to a remedy. Ships as standard freight.\u003c\/p\u003e\n\n\u003ch3\u003eCommon questions\u003c\/h3\u003e\n\u003ch4\u003eWhat calcium level should a reef tank run at?\u003c\/h4\u003e\n\u003cp\u003eAPI's guidance for reef aquariums is a calcium concentration between 400 and 500 mg\/L (ppm). Most stony coral and clam keepers dose to hold within that band and test weekly to catch drift before growth slows.\u003c\/p\u003e\n\u003ch4\u003eHow often should I test calcium?\u003c\/h4\u003e\n\u003cp\u003eAPI recommends weekly testing for saltwater tanks. Calcium demand rises with coral growth and stocking, so a tank that is growing well can draw down faster over time and may need more frequent checks.\u003c\/p\u003e\n\u003ch4\u003eHow many tests are in the kit?\u003c\/h4\u003e\n\u003cp\u003eAPI does not publish an exact test count for this kit on its own product information — unlike its colour-chart kits, a titration kit's test count depends on how many drops each individual test uses, which varies with the sample's calcium level. Expect several dozen tests from a full kit at typical reef calcium levels.\u003c\/p\u003e\n\u003ch4\u003eDoes low calcium affect fish, or only corals and invertebrates?\u003c\/h4\u003e\n\u003cp\u003eCalcium demand in a reef tank is driven mainly by calcifying corals, clams and coralline algae rather than by fish. A fish-only saltwater tank is far more forgiving of calcium drift, though calcium still contributes to overall water hardness and pH stability.\u003c\/p\u003e","brand":"API","offers":[{"title":"Default Title","offer_id":54774195224867,"sku":null,"price":54.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/APH228_5.jpg?v=1772082122","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/api-calcium-test-kit-liquid-1-25oz-saltwater","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}