{"product_id":"seachem-multitest-phosphate-75-tests","title":"Seachem MultiTest: Phosphate 75 Tests","description":"\u003cp\u003e\u003cstrong\u003eTracks the nutrient that feeds nuisance algae before it becomes a bloom.\u003c\/strong\u003e Seachem MultiTest Phosphate measures inorganic phosphate down to less than 0.05 mg\/L across a 0–3.0 mg\/L range, in both marine and freshwater aquariums, with colour-chart steps as fine as 0.001–0.1 mg\/L. Results read on a distinctive yellow-green-blue colour scale rather than the pink or blue scales used for most other parameters, which makes it harder to misread against another chart by mistake.\u003c\/p\u003e\n\u003ch3\u003eWhy test phosphate\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNatural seawater runs from under 0.01 up to about 0.3 mg\/L phosphate — reef tanks generally do best kept at 0.2 mg\/L or below for coral health.\u003c\/li\u003e\n\u003cli\u003ePhosphate itself is non-toxic to fish and most invertebrates, but keeping it under roughly 1 mg\/L helps limit nuisance algae growth.\u003c\/li\u003e\n\u003cli\u003eFreshwater tanks often run higher than the kit's 3.0 mg\/L range — dilute the sample with distilled or RO water and multiply the result to read a high concentration accurately.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOver 75 tests per kit\u003c\/strong\u003e — around 82c per test at full retail price.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRange 0–3.0 mg\/L\u003c\/strong\u003e, detecting changes as fine as 0.001–0.1 mg\/L on the colour chart.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSix-cavity opaque white test plate\u003c\/strong\u003e — run and compare up to six samples at once.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSliding colour chart with a 5 cm viewing window\u003c\/strong\u003e for a cleaner colour match.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReference sample included\u003c\/strong\u003e to validate the kit whenever a result looks off.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFreshwater and marine\u003c\/strong\u003e — one kit for the whole store's tank types.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eTests per kit\u003c\/th\u003e\n\u003ctd\u003e75+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRange\u003c\/th\u003e\n\u003ctd\u003e0–3.0 mg\/L phosphate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDetection limit\u003c\/th\u003e\n\u003ctd\u003eLess than 0.05 mg\/L; chart steps of 0.001–0.1 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWater type\u003c\/th\u003e\n\u003ctd\u003eFreshwater and marine\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCost per test\u003c\/th\u003e\n\u003ctd\u003e82c per test\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSKU \/ Barcode\u003c\/th\u003e\n\u003ctd\u003e725141-970 \/ 000116097000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eWhat's included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePhosphate Reagents 1 and 2\u003c\/li\u003e\n\u003cli\u003ePhosphate reference sample\u003c\/li\u003e\n\u003cli\u003eStir rod and sample pipette\u003c\/li\u003e\n\u003cli\u003ePhosphate colour chart\u003c\/li\u003e\n\u003cli\u003eMulti-cavity test plate and instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDirections\u003c\/h3\u003e\n\u003cp\u003eDose a sample with Phosphate Reagents 1 and 2 in order, stir, and read against the sliding colour chart within the stated development time. Freshwater samples reading off the top of the scale should be diluted with distilled or RO water — halve with an equal volume of distilled water and double the result, for example — rather than treated as unreadable.\u003c\/p\u003e\n\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eSuitable for:\u003c\/strong\u003e reef, FOWLR, planted and community freshwater tanks tracking algae-feeding nutrients.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e reading freshwater phosphate accurately without dilution when levels run high, which is common in heavily-stocked or heavily-fed freshwater tanks — dilute first rather than assuming the kit is wrong.\u003c\/p\u003e\n\u003ch3\u003eSafety\u003c\/h3\u003e\n\u003cp\u003eKeep away from children. Reagent 2 contains sulfuric and molybdic acids and is corrosive — protect work surfaces, avoid skin and eye contact, and rinse any contact thoroughly with water.\u003c\/p\u003e\n\u003ch3\u003eGoes well with\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/seachem-multitest-ammonia-75-tests\"\u003eSeachem MultiTest Ammonia\u003c\/a\u003e — phosphate and ammonia together cover the two most common causes of algae and livestock stress.\u003c\/li\u003e\n\u003cli\u003eA phosphate-removing media or reactor, for tanks where results consistently read high and a media-based export is wanted alongside water changes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\n\u003cp\u003eShips as a standard parcel. Store reagents away from direct sunlight and extreme heat. Covered by the consumer guarantees under Australian Consumer Law in addition to Seachem's own guarantee.\u003c\/p\u003e\n\u003ch3\u003eCommon questions\u003c\/h3\u003e\n\u003ch4\u003eWhy is my freshwater phosphate reading off the chart?\u003c\/h4\u003e\n\u003cp\u003eFreshwater tanks frequently run higher phosphate than marine tanks and can exceed this kit's 0–3.0 mg\/L range. Dilute the sample with distilled or RO water in a known ratio and multiply the result back up, rather than assuming the test has failed.\u003c\/p\u003e\n\u003ch4\u003eWhat phosphate level should I be aiming for in a reef tank?\u003c\/h4\u003e\n\u003cp\u003eSeachem's guidance is to keep reef systems at or below about 0.2 mg\/L for coral health, with natural seawater typically under 0.3 mg\/L.\u003c\/p\u003e\n\u003ch4\u003eIs phosphate actually harmful to my fish?\u003c\/h4\u003e\n\u003cp\u003eNot directly — phosphate is non-toxic to fish and most invertebrates at aquarium concentrations. The problem is indirect: elevated phosphate feeds nuisance algae, which affects the tank's appearance and can compete with corals and plants.\u003c\/p\u003e\n\u003ch4\u003eHow many tests will I get from one kit?\u003c\/h4\u003e\n\u003cp\u003eOver 75, at roughly 82c per test — enough for regular weekly or fortnightly testing across a typical home aquarium for many months.\u003c\/p\u003e\n\u003ch4\u003eCan I use the same kit for freshwater and marine tanks?\u003c\/h4\u003e\n\u003cp\u003eYes, the kit is rated for both — just remember freshwater samples may need diluting to fall inside the readable range.\u003c\/p\u003e","brand":"Seachem","offers":[{"title":"Default Title","offer_id":54773854994723,"sku":"725141-970","price":61.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/seachem-multitest-phosphate-75-tests-722595.webp?v=1790230840","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/seachem-multitest-phosphate-75-tests","provider":"Nicks AOT","version":"1.0","type":"link"}