{"product_id":"fluval-u4-poly-carbon-cartridge-2","title":"Fluval U4 - Poly\/Carbon Cartridge (2)","description":"\u003cp\u003e\u003cstrong\u003eFresh poly and carbon media for a Fluval U4 that's started running cloudy or smelling musty.\u003c\/strong\u003e This two-pack of poly\/carbon cartridges is the chemical and secondary mechanical stage for the Fluval U4 internal filter — polyester floss to catch the fine particles the foam misses, wrapped around activated carbon to pull colour, odour and dissolved organics out of the water.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine Fluval U4 cartridge\u003c\/strong\u003e — direct fit, no trimming or repacking\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoly floss layer\u003c\/strong\u003e — mechanical polish for water clarity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActivated carbon core\u003c\/strong\u003e — removes discolouration, odour and dissolved organics\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo cartridges per pack\u003c\/strong\u003e — one full media change for the U4's cartridge stage\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eFits\u003c\/th\u003e\n\u003ctd\u003eFluval U4 internal filter only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSKU\u003c\/th\u003e\n\u003ctd\u003eBA3812\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003ctd\u003ePoly floss + activated carbon cartridge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack size\u003c\/th\u003e\n\u003ctd\u003e2 cartridges\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\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eWill it fit my filter?\u003c\/h3\u003e\u003cp\u003eThese cartridges are sized for the \u003cstrong\u003eFluval U4\u003c\/strong\u003e (rated to 240 L \/ 65 US Gal, 1,000 L\/h), which ships with two as standard. They are not interchangeable with the smaller U1, U2 or U3 cartridges — check the model moulded into the filter body first.\u003c\/p\u003e\u003ch3\u003eCare and maintenance\u003c\/h3\u003e\u003cp\u003eActivated carbon has a working life, not an indefinite one — once it's saturated it stops adsorbing and can start releasing what it's captured back into the water. Fluval's general guidance is to replace carbon media roughly monthly for consistent clarity; tanks with heavy bioload or tannin-heavy décor will exhaust it faster. Rinse the poly side in removed tank water between changes if it's still catching debris.\u003c\/p\u003e\u003ch3\u003eSuitable for\u003c\/h3\u003e\u003cp\u003eFreshwater and marine aquariums running a Fluval U4. Not a biological media — leave the U4's BIOMAX rings in place when you change this cartridge, since that's where the bacteria colony actually lives.\u003c\/p\u003e\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\u003cp\u003eGenuine Fluval part, covered against manufacturing defects, in addition to your rights under the Australian Consumer Law, which cannot be excluded. Ships as a standard parcel.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eDoes this replace all the media in my U4?\u003c\/h4\u003e\u003cp\u003eNo — the U4 also runs foam pads and BIOMAX biological rings, sold separately. This cartridge covers the poly\/carbon stage only.\u003c\/p\u003e\u003ch4\u003eHow often should I change it?\u003c\/h4\u003e\u003cp\u003eAround monthly for most tanks, sooner if the water is heavily stocked or discoloured by driftwood or tannins.\u003c\/p\u003e\u003ch4\u003eWill running carbon remove my medication?\u003c\/h4\u003e\u003cp\u003eYes. Remove carbon media, including this cartridge, before dosing any fish medication, and don't replace it until the course is finished.\u003c\/p\u003e","brand":"Fluval","offers":[{"title":"Default Title","offer_id":55242291314979,"sku":"BA3812","price":11.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/fluval-u4-poly-carbon-cartri-43180004868387.webp?v=1790234313","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/fluval-u4-poly-carbon-cartridge-2","provider":"Nicks AOT","version":"1.0","type":"link"}