{"product_id":"fluval-foam-filter-block-for-flex-aquarium-kit","title":"Fluval Foam Filter Block for Flex Aquarium Kit","description":"\u003cp\u003eThe \u003cstrong\u003eFluval Foam Filter Block\u003c\/strong\u003e is the genuine replacement mechanical foam for the rear filter chamber of the larger Fluval Flex aquariums. As water passes through, the open-cell foam traps debris, uneaten food, and waste before they cloud your tank, keeping the water clear and protecting the biological media behind it. Keep a spare on hand so a routine swap is quick and mess-free. Browse our \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/filter-media-cartridges\" style=\"color:#666;font-weight:600;text-decoration:underline;\"\u003efilter media and cartridges\u003c\/a\u003e for the rest of your maintenance kit.\u003c\/p\u003e\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Fluval replacement foam block\u003c\/li\u003e\n\u003cli\u003eOpen-cell foam traps large and fine particles for mechanical filtration\u003c\/li\u003e\n\u003cli\u003eProtects biological and chemical media and keeps flow strong\u003c\/li\u003e\n\u003cli\u003eRinse in tank water to reuse; replace when it starts to break down\u003c\/li\u003e\n\u003cli\u003eSafe for freshwater and saltwater aquariums\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFluval Flex, 15 US gal \/ 57 L\u003c\/li\u003e\n\u003cli\u003eFluval Flex, 32.5 US gal \/ 123 L\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"font-size:0.9em;color:#666;\"\u003eFor the smaller Flex 9 gallon, Spec, Evo, and Betta kits, use the Fluval Foam Filter Block for those nano kits.\u003c\/p\u003e\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"border-collapse:collapse;width:100%;margin:6px 0 4px;font-size:0.95em;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:6px 10px;background:#f6f6f6;font-weight:600;\"\u003eType\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:6px 10px;\"\u003eMechanical filter foam block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:6px 10px;background:#f6f6f6;font-weight:600;\"\u003eFits\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:6px 10px;\"\u003eFluval Flex 15 gal and Flex 32.5 gal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:6px 10px;background:#f6f6f6;font-weight:600;\"\u003eWater type\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:6px 10px;\"\u003eFreshwater and saltwater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:6px 10px;background:#f6f6f6;font-weight:600;\"\u003eBrand\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;padding:6px 10px;\"\u003eFluval\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003eRecommended Pairings\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/fluval-flex-32-5-aquarium-kit\" style=\"color:#666;font-weight:600;text-decoration:underline;\"\u003eFluval Flex 32.5 Aquarium Kit\u003c\/a\u003e — the aquarium this foam block keeps running clean.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/fluval-foam-filter-block-for-spec-evo-flex-betta-aquarium-kit\" style=\"color:#666;font-weight:600;text-decoration:underline;\"\u003eFluval Foam Filter Block for nano kits\u003c\/a\u003e — the matching foam for Spec, Evo, Flex 9, and Betta.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/maintenance-water-care\" style=\"color:#666;font-weight:600;text-decoration:underline;\"\u003eWater care and conditioners\u003c\/a\u003e — keep spare media and treatments stocked.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow often should I replace the foam?\u003c\/strong\u003e Rinse it in old tank water at each water change to clear trapped debris, and replace it when it starts to fall apart or no longer springs back, usually every few months.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould I replace all my media at once?\u003c\/strong\u003e No. Swap the foam separately from your biological media so you never remove all your beneficial bacteria at the same time.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich Flex does this fit?\u003c\/strong\u003e This block fits the Fluval Flex 15 gallon and Flex 32.5 gallon aquariums. For the Flex 9 gallon or the Spec, Evo, and Betta kits, use the nano foam block.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use it in saltwater?\u003c\/strong\u003e Yes. The foam is inert and works in both freshwater and marine setups.\u003c\/p\u003e","brand":"Fluval","offers":[{"title":"Flex 15\/32","offer_id":48910492172507,"sku":null,"price":9.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/image_638ceb76-8bcd-4240-89bc-0962573a864e.jpg?v=1782474828","url":"https:\/\/squeakysaquatics.com\/products\/fluval-foam-filter-block-for-flex-aquarium-kit","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}