{"product_id":"red-sea-marine-care-ph-alk-test-100-55-tests","title":"Red Sea Marine Care pH\/Alk Test 100\/55 Tests","description":"\u003cp\u003e\u003cstrong\u003eTest the pair that actually explains your marine water chemistry.\u003c\/strong\u003e The Red Sea Marine Care pH\/Alkalinity Test Kit measures pH (100 tests) and alkalinity\/KH (55 tests) in marine and reef aquariums — two parameters that move together, since a weak alkalinity buffer is the most common cause of a swinging pH.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo linked parameters in one kit\u003c\/strong\u003e — pH and alkalinity share the same causes and the same fixes, so testing them together tells you more than either alone.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100 pH tests, 55 alkalinity tests\u003c\/strong\u003e — enough for months of weekly testing on a single system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColorimetric pH, titration-based alkalinity\u003c\/strong\u003e — pH develops colour in around 10 seconds and stays stable to read for 5 minutes; alkalinity is read by counting reagent drops to a colour-change endpoint.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComparison cards included\u003c\/strong\u003e — no separate colour chart to lose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEntry point into Red Sea's Reef Care Program\u003c\/strong\u003e — results line up with the dosing guidance for Red Sea's Reef Foundation supplements.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eTests per kit\u003c\/th\u003e\n\u003cth\u003eRange\u003c\/th\u003e\n\u003cth\u003eResolution \/ accuracy\u003c\/th\u003e\n\u003cth\u003eMethod\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003epH\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e7.6 – 8.6\u003c\/td\u003e\n\u003ctd\u003e±0.2\u003c\/td\u003e\n\u003ctd\u003eColorimetric (liquid indicator + comparison card)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAlkalinity (KH)\u003c\/td\u003e\n\u003ctd\u003e55\u003c\/td\u003e\n\u003ctd\u003e0 dKH and up\u003c\/td\u003e\n\u003ctd\u003e1 °dKH \/ 0.36 meq\/L (0.5 °dKH resolution using the 10 mL sample volume)\u003c\/td\u003e\n\u003ctd\u003eDrop-count titration to colour-change endpoint\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eWhich Red Sea test kit do I need?\u003c\/h3\u003e\u003cp\u003eThis is the everyday tier of Red Sea's pH\/alkalinity testing. If you're chasing tighter reef-tank precision — dosing a calcium reactor or a two-part system where a swing of a few hundredths matters — Red Sea's KH\/Alkalinity Pro Test Kit uses a finer titration for higher resolution. For routine weekly monitoring on a fish-only or mixed reef system, this kit is the right level of precision.\u003c\/p\u003e\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuitable for:\u003c\/strong\u003e marine and reef aquariums, fish-only and mixed reef systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e freshwater aquariums — Red Sea markets this kit specifically for marine use.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat to do with the result\u003c\/h3\u003e\u003cp\u003eIf alkalinity comes back low, Red Sea's own guidance ties this kit's results to its Foundation supplement range — Reef Foundation B for mixed reef systems, or KH-Coralline Gro in fish-only marine systems — dosed against the reading you get here. Stable alkalinity is what holds pH steady, so it's worth correcting alkalinity before adjusting pH directly.\u003c\/p\u003e\u003ch3\u003eCare and storage\u003c\/h3\u003e\u003cp\u003eReagents are stable up to the date printed on the pack when stored closed between 15°C and 25°C. Keep the kit out of direct sun and away from the tank splash zone — reagent bottles that pick up tank water give false readings.\u003c\/p\u003e\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\u003cp\u003eCovered by the manufacturer's standard warranty against defects, in addition to your rights under Australian Consumer Law. Standard shipping across Australia.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eHow often should I test pH and alkalinity?\u003c\/h4\u003e\u003cp\u003eWeekly on an established reef tank, and more often — every day or two — after a water change, a new coral addition, or any dosing change.\u003c\/p\u003e\u003ch4\u003eDoes this kit include calibration or reference solutions?\u003c\/h4\u003e\u003cp\u003eNo. The kit contains the pH indicator, alkalinity reagent, a sample vial, a syringe and two comparison cards — no separate calibration standard is included.\u003c\/p\u003e\u003ch4\u003eWhy does my alkalinity reading keep drifting even though I dose consistently?\u003c\/h4\u003e\u003cp\u003eCoral growth and calcification consume alkalinity continuously, so a stable dose doesn't always mean a stable reading — increasing bioload usually means increasing demand. Retest after any change in stocking or growth rate.\u003c\/p\u003e\u003ch4\u003eCan I use this kit on a freshwater tank?\u003c\/h4\u003e\u003cp\u003eRed Sea markets this kit for marine and reef use. It is not intended for freshwater testing.\u003c\/p\u003e\u003ch4\u003eWhat's the difference between this kit and the Pro version?\u003c\/h4\u003e\u003cp\u003eBoth measure the same parameters. The Pro kit uses a finer titration step for higher resolution, aimed at reef keepers chasing tighter precision — this standard kit is accurate enough for regular monitoring on most systems.\u003c\/p\u003e","brand":"RedSea","offers":[{"title":"Default Title","offer_id":54774154363171,"sku":"RED310","price":41.5,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/RED310.png?v=1772078678","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/red-sea-marine-care-ph-alk-test-100-55-tests","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}