{"product_id":"under-gravel-aquarium-filter-system-20-gallon-undergravel-filter-20-plates-20-gal","title":"Under Gravel Aquarium Filter System, 20 Gallon Undergravel Filter 20 Plates, 20 Gal","description":"\u003ch3\u003eUnder Gravel Aquarium Filter System, 20 Gallon Undergravel Filter\u003c\/h3\u003e\n\u003cp id=\"b\"\u003eProduct description BaoZqua undergravel filter system is a modular, air-driven\nfiltration solution designed for small to medium aquariums that want clearer\nwater, better circulation, and a stable biological base under the substrate.\nBy pairing the filter plates with an external air pump (sold separately), the\nsystem pulls water downward through the gravel bed and then lifts it back up\nthrough the riser tube. This under-bed circulation helps trap fine waste\ninside the gravel layer, supports microbial growth on the plates and\nsubstrate, and keeps water moving through the bottom of the tank instead of\nletting debris settle in dead spots. The system comes in three selectable\nsizes so hobbyists can match it to their tank: 6-plate kit with 1 lift tube –\nfits about 5 gallon aquariums 12-plate kit with 1 lift tube – fits about 10\ngallon aquariums 20-plate kit with 2 lift tubes – fits about 20 gallon\naquariums Each plate uses a snap-fit, build-any-layout design. Plates feature\nfine 0.06\" gaps to keep sand\/gravel from falling through, and the reinforced\nbase is made to hold heavier substrates such as planted-tank gravel. Lift\ntubes are height-adjustable and can be trimmed to match the waterline of\ndifferent tanks. This under gravel aquarium filter is ideal for setups that\nwant air-driven biofiltration, optional pump-powered circulation, or even a\ncanister-linked dual-filtration layout. Every kit includes the core parts you\nneed to assemble the platform—filter plates, lift tube(s), airline tubing,\ncheck valve, flow regulator, and extra air stone—so installation stays plug-\nand-play. Just connect to your own air pump (2–4 W for 5 gal, higher wattage\nfor bigger tanks) and the system will help improve clarity and flow over time.\nAir pump, submersible pump, and canister filter are not included, so please\nprepare your own equipment if you want to use those configurations. Directions\nPlace Plates: Lay the modular undergravel plates flat on the tank bottom.\nConnect Tubing: Attach the lift tube, airline tubing, check valve, and\nregulator. Add Substrate: Cover plates fully with gravel or sand to hold them\nin place. Connect Air Pump: Hook up to your external air pump (not included)\nand turn it on. Adjust Flow: Trim\/adjust the lift tube and airflow until\ncirculation is stable.\u003c\/p\u003e \n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n  \u003cul class=\"a\"\u003e\n         \u003cli\u003eComplete Filter Kit: Includes 6 interlocking filter plates, 1 adjustable lift tube set (with fitting), 1 check valve, 1 regulator, 1 extra air stone, 1 x 39\" extra airline tubing, and all required connectorseverything to build your undergravel system. (Please note: air pump and tank are not included and must be prepared separately.)\u003c\/li\u003e\n         \u003cli\u003eEfficient Undergravel Filtration: An external air pump (not included) supplies continuous airflow that drives water circulation, pulling water downward through the substrate and filter plates to trap debris and finesdelivering clear, clean water and steady flow in fish tanks.\u003c\/li\u003e\n         \u003cli\u003eBiofiltration \u0026amp; Aeration: Beneficial nitrifying microbes colonize the gravel bed and plate surfaces to break down ammonia and nitrite. Air-driven flow oxygenates the water column, supporting active fish behavior and a stable biological cycle for a cleaner, balanced tank.\u003c\/li\u003e\n         \u003cli\u003eModular Plate Design: Includes 6 snap-fit undergravel plates (coverage up to 11.02\" x 8.26\"). Fine 0.06\" mesh helps keep sand\/gravel from fall-through; sturdy base helps resist bottom cracks and holds heavy substrate, improving water circulation and biofiltration in freshwater or saltwater tanks.\u003c\/li\u003e\n         \u003cli\u003eEasy Installation: Tool-free setuplay plates, add substrate, attach the lift tube, and connect to an air pump (not included). The lift tube is adjustable and DIY cut-to-fit; use the included check valve to help stop backflow, and for 5 gal aquariums we recommend a quiet 24W air pump for optimal flow.\u003c\/li\u003e\n  \u003c\/ul\u003e","brand":"BaoZqua","offers":[{"title":"20 Plates, 20 Gal","offer_id":45256460042440,"sku":"uk-B0FYDJNKF6","price":231.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0269\/1376\/7486\/files\/uk-B0FYDJNKF6.jpg?v=1794638586","url":"https:\/\/pawsplanetshop.com\/products\/under-gravel-aquarium-filter-system-20-gallon-undergravel-filter-20-plates-20-gal","provider":"PawsPlanet Australia","version":"1.0","type":"link"}