{"product_id":"fluval-chi-aquarium-foam-pad-replacement","title":"Fluval CHI Aquarium Foam Pad Replacement","description":"\u003cp\u003e\u003cstrong\u003eThe coarse stage that keeps a Fluval CHI's filter cube working properly.\u003c\/strong\u003e This is the genuine foam pad — the coarser mechanical and biological stage of the CHI's concealed filter cube — sized for the Fluval CHI and Fluval CHI II 5 US gallon (19 L) aquarium kit, model 10505.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine Fluval part A1421\u003c\/strong\u003e — the coarse foam element of the CHI's two-stage filter cube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCatches larger debris\u003c\/strong\u003e and gives beneficial filter bacteria somewhere to colonise.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLonger service life than the filter pad\u003c\/strong\u003e — built to run around 2–3 months between full changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorks alongside the filter pad\u003c\/strong\u003e — together they form the CHI's dual-stage mechanical filter (filter pad sold separately).\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePart number\u003c\/th\u003e\n\u003ctd\u003eA1421\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFits\u003c\/th\u003e\n\u003ctd\u003eFluval CHI \u0026amp; Fluval CHI II, 5 US gal (19 L), model 10505\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFiltration stage\u003c\/th\u003e\n\u003ctd\u003eMechanical and biological — coarse debris plus bacteria colonisation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended replacement\u003c\/th\u003e\n\u003ctd\u003eEvery 2–3 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eWill it fit my filter?\u003c\/h3\u003e\u003cp\u003eCheck your CHI is the 5 US gallon (19 L) model 10505 — the compact bowl-style kit with a rotating top filter cube, sold as both the original Fluval CHI and the later Fluval CHI II. We haven't been able to confirm this pad also fits the larger 25 L (6.6 US gal) Fluval CHI II, model 10508 — check your filter cube size before ordering if you have that model, or get in touch and we'll help confirm.\u003c\/p\u003e\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\u003cp\u003eSuitable for routine servicing of the 5 US gallon (19 L) CHI or CHI II. This listing is the foam pad only — it isn't a substitute for the finer filter pad, which handles a different filtration stage and is sold separately.\u003c\/p\u003e\u003ch3\u003eCare and maintenance\u003c\/h3\u003e\u003cp\u003eFluval's care guide calls for a full foam pad replacement around every 2–3 months. Between full changes, a gentle rinse in removed tank water — not tap water — clears trapped debris without stripping out all of the bacteria it's carrying.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eHow often should I replace the Fluval CHI foam pad?\u003c\/h4\u003e\u003cp\u003eAround every 2–3 months under normal stocking, per Fluval's care guide — sooner in a heavily stocked tank.\u003c\/p\u003e\u003ch4\u003eCan I just rinse it instead of replacing it?\u003c\/h4\u003e\u003cp\u003eA gentle rinse in tank water between changes is fine and protects the bacteria colony, but the foam still needs full replacement periodically as it compacts and degrades.\u003c\/p\u003e\u003ch4\u003eWill this fit the larger 25 L Fluval CHI II?\u003c\/h4\u003e\u003cp\u003eThis listing is sized for the 5 US gallon (19 L) CHI and CHI II, model 10505. We haven't confirmed fitment on the larger 25 L (6.6 US gal) model 10508 — check your filter cube against the pad before ordering.\u003c\/p\u003e\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\u003cp\u003eCovered by your rights under Australian Consumer Law, in addition to Fluval's standard parts warranty against manufacturing defects. Small, lightweight item — standard parcel delivery Australia-wide.\u003c\/p\u003e","brand":"Fluval","offers":[{"title":"Default Title","offer_id":55293289103651,"sku":"CHI04","price":3.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/CHI04.png?v=1782879120","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/fluval-chi-aquarium-foam-pad-replacement","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}