{"product_id":"fluval-phosphate-cartridge-g6","title":"Fluval Phosphate Cartridge G6","description":"\u003cp\u003e\u003cstrong\u003eDrop-in phosphate media for the Fluval G6, sized for its larger media chamber.\u003c\/strong\u003e The Fluval G6 Phosphate Cartridge (A420) is a genuine replacement module for the G6 Advanced Filtration System, removing up to 3900 mg of phosphate ion from fresh or marine aquarium water before it can feed nuisance algae.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine Fluval A420\u003c\/strong\u003e — the exact phosphate module engineered for the G6's stackable media chamber, not a generic pad cut to fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemoves up to 3900 mg of phosphate ion\u003c\/strong\u003e — almost double the G3 cartridge's capacity, matching the G6's larger media stack.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFresh or marine\u003c\/strong\u003e — one cartridge works across both water types.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrop-in fit\u003c\/strong\u003e — slots straight into the G6's media stack alongside the pre-filter and biological stages, no cutting or soaking required.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer part number\u003c\/td\u003e\n\u003ctd\u003eA420\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFits\u003c\/td\u003e\n\u003ctd\u003eFluval G6 Advanced Filtration System\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePhosphate removal capacity\u003c\/td\u003e\n\u003ctd\u003eUp to 3900 mg of phosphate ion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater type\u003c\/td\u003e\n\u003ctd\u003eFreshwater and marine\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eFluval does not publish a stated service life in weeks or months for this cartridge — capacity depends on how much phosphate is in the water it's treating, so replacement is best guided by a phosphate test kit rather than the calendar. That figure is left off rather than guessed.\u003c\/p\u003e\u003ch3\u003eNot included\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eThe G6 Advanced Filter itself.\u003c\/strong\u003e This cartridge is a media module for the existing filter, not a standalone unit.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\u003cp\u003eSuitable for a Fluval G6 filter running elevated phosphate — visible as green or brown algae despite otherwise good water quality. Not a substitute for regular water changes, and it won't remove phosphate that's bound up in substrate or decor rather than dissolved in the water column.\u003c\/p\u003e\u003ch3\u003eCare and maintenance\u003c\/h3\u003e\u003cp\u003eRinse the cartridge housing in tank water at each filter service to clear trapped debris, and retest phosphate levels with a test kit before assuming the cartridge still has capacity left — a saturated cartridge stops working with no visible sign.\u003c\/p\u003e\u003ch3\u003eGoes well with\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/fluval-pre-filter-cartridge-g6\"\u003eFluval Pre Filter Cartridge G6\u003c\/a\u003e — protects this cartridge from clogging with debris.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/fluval-fine-pre-filter-cartridge-g6\"\u003eFluval Fine Pre Filter Cartridge G6\u003c\/a\u003e — an extra polishing stage ahead of the phosphate media.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/fluval-nitrate-cartridge-g6\"\u003eFluval Nitrate Cartridge G6\u003c\/a\u003e — pairs with phosphate removal for full nutrient control.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\u003cp\u003eCovered against manufacturing defects, in addition to your rights under Australian Consumer Law. Standard freight applies.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eHow long does the G6 phosphate cartridge last?\u003c\/h4\u003e\u003cp\u003eIt depends on how much phosphate is in the water, not a fixed number of weeks. Test regularly with a phosphate test kit and replace once readings start climbing again.\u003c\/p\u003e\u003ch4\u003eDoes it work in a marine tank?\u003c\/h4\u003e\u003cp\u003eYes, it's rated for both freshwater and marine use.\u003c\/p\u003e\u003ch4\u003eWill it fit the Fluval G3?\u003c\/h4\u003e\u003cp\u003eNo — the G3 uses its own, smaller phosphate cartridge (A419) sized for its smaller media chamber.\u003c\/p\u003e\u003ch4\u003eDo I need to rinse it before use?\u003c\/h4\u003e\u003cp\u003eNo rinsing is required before fitting; just drop it into the media stack as directed in the G6 manual.\u003c\/p\u003e","brand":"Fluval","offers":[{"title":"Default Title","offer_id":55293297295651,"sku":"FG02C","price":60.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/FG02c.png?v=1782879624","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/fluval-phosphate-cartridge-g6","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}