{"product_id":"calcium-magnesium-test-kit","title":"Calcium \u0026 Magnesium Test Kit","description":"\u003ch2\u003eBenchmark Calcium \u0026amp; Magnesium Test Kit\u003c\/h2\u003e\n\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe Benchmark Calcium \u0026amp; Magnesium Test Kit is a titration-based test kit for measuring two core reef chemistry parameters in saltwater aquariums: calcium and magnesium. Using separate reagent steps for calcium and total hardness, it gives reef hobbyists a practical way to track two major elements that support coral growth, skeletal development, and overall system stability.\u003c\/p\u003e\n\n\u003cp\u003eThis kit is designed for routine reef testing with clear step-by-step procedures, easy-to-read syringe measurements, and conversion methods that help turn titration results into usable ppm values.\u003c\/p\u003e\n\n\u003ch3\u003eWhat It Does\u003c\/h3\u003e\n\u003cp\u003eThis kit measures calcium in ppm and calculates magnesium in ppm using calcium and total hardness titration results together. It is useful for monitoring element consumption, checking dosing adjustments, and maintaining consistency in reef aquariums.\u003c\/p\u003e\n\n\u003cp\u003eThe calcium test uses a 5.00 mL sample and is calculated as:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCalcium (ppm) = mL calcium titrant used x 600\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe magnesium result is calculated from the total hardness and calcium titration volumes:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMagnesium (ppm) = (1701.35 x mL total hardness titrant) - (363.87 x mL calcium titrant)\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eFor example, if calcium titrant usage is 0.70 mL, the calcium result is 420 ppm. If total hardness titrant usage is 0.91 mL and calcium titrant usage is 0.70 mL, the magnesium result is 1294 ppm.\u003c\/p\u003e\n\n\u003ch3\u003eWho It’s For\u003c\/h3\u003e\n\u003cp\u003eThis kit is intended for saltwater aquarium hobbyists who want a dependable way to monitor calcium and magnesium as part of routine reef maintenance. It is well suited for mixed reefs, SPS systems, LPS systems, nano tanks, and larger marine aquariums where stable major-element levels matter.\u003c\/p\u003e\n\n\u003ch3\u003eHow to Use\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eCalcium Test\u003c\/strong\u003e\u003c\/p\u003e\n\u003col\u003e\n  \u003cli\u003eAdd 5.00 mL aquarium water to the test vial.\u003c\/li\u003e\n  \u003cli\u003eAdd 1.00 mL of 4% sodium hydroxide.\u003c\/li\u003e\n  \u003cli\u003eAdd one level scoop of calcium indicator powder.\u003c\/li\u003e\n  \u003cli\u003eSwirl until the sample becomes pink.\u003c\/li\u003e\n  \u003cli\u003eSlowly add calcium titrant while swirling.\u003c\/li\u003e\n  \u003cli\u003eStop when the color changes to purple.\u003c\/li\u003e\n  \u003cli\u003eCalculate calcium using: \u003cstrong\u003emL x 600\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003cp\u003e\u003cstrong\u003eTotal Hardness \/ Magnesium Test\u003c\/strong\u003e\u003c\/p\u003e\n\u003col\u003e\n  \u003cli\u003eAdd 5.00 mL aquarium water to a clean vial.\u003c\/li\u003e\n  \u003cli\u003eAdd 0.50 mL pH 10 hardness buffer.\u003c\/li\u003e\n  \u003cli\u003eAdd 2 drops of calmagite indicator.\u003c\/li\u003e\n  \u003cli\u003eSlowly add total hardness titrant while swirling.\u003c\/li\u003e\n  \u003cli\u003eStop when the solution turns pure blue with no red or purple tint remaining.\u003c\/li\u003e\n  \u003cli\u003eUse the calcium and total hardness readings together to calculate magnesium.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003cp\u003eFor best repeatability, use clean vials and syringes and read the endpoint under bright, neutral lighting.\u003c\/p\u003e\n\n\u003ch3\u003eWhat’s Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e118 mL calcium titrant bottle\u003c\/li\u003e\n  \u003cli\u003e118 mL total hardness titrant bottle\u003c\/li\u003e\n  \u003cli\u003e118 mL 4% sodium hydroxide bottle\u003c\/li\u003e\n  \u003cli\u003e118 mL pH 10 hardness buffer bottle\u003c\/li\u003e\n  \u003cli\u003eCalmagite indicator bottle\u003c\/li\u003e\n  \u003cli\u003eCalcium indicator powder container\u003c\/li\u003e\n  \u003cli\u003e0.15 cc scoop\u003c\/li\u003e\n  \u003cli\u003e1 mL syringes\u003c\/li\u003e\n  \u003cli\u003eGlass test vials\u003c\/li\u003e\n  \u003cli\u003eInstruction card\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Reef Range\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eCalcium: 380-460 ppm\u003c\/li\u003e\n  \u003cli\u003eMagnesium: 1200-1400 ppm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned for 5.00 mL sample volume testing\u003c\/li\u003e\n  \u003cli\u003eFor saltwater aquarium use\u003c\/li\u003e\n  \u003cli\u003eCareful syringe reading and endpoint observation are important for reliable results\u003c\/li\u003e\n  \u003cli\u003eStore reagents sealed at room temperature\u003c\/li\u003e\n  \u003cli\u003eProtect indicator solutions from light and keep powder reagents dry\u003c\/li\u003e\n  \u003cli\u003eKeep out of reach of children\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePurchase Confidence\u003c\/h3\u003e\n\u003cp\u003eThe Benchmark Calcium \u0026amp; Magnesium Test Kit gives reef hobbyists a practical way to monitor two essential major elements with one organized testing system. It is built for routine reef use, with dedicated reagents for calcium and magnesium testing, clear result formulas, and the tools needed to run the tests consistently.\u003c\/p\u003e\n\n\u003cp\u003eIt is a good fit for hobbyists who want a dependable calcium and magnesium testing option for ongoing reef maintenance and dosing verification.\u003c\/p\u003e","brand":"Benchmark","offers":[{"title":"Default Title","offer_id":48124621095166,"sku":null,"price":79.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0058\/6242\/4647\/files\/calcium-magnesium.png?v=1777385274","url":"https:\/\/ndaquaculture.ca\/products\/calcium-magnesium-test-kit","provider":"New Dawn Aquaculture","version":"1.0","type":"link"}