{"product_id":"penn-plax-undergravel-aquarium-filter-for-15-20-gallon-tanks-clear-free-premium-ugfs","title":"Penn-Plax Undergravel Aquarium Filter for 15-20 Gallon Tanks – Clear-Free Premium UGFs","description":"\u003ch2\u003eClear-Free Premium Under Gravel Filter\u003c\/h2\u003e\n\u003cp\u003eThe Penn-Plax Clear-Free Premium Under Gravel Filter is a trusted, air-driven filtration system built for 15-20 gallon high tanks. Placed beneath the substrate, it gently draws water through gravel and filter plates while circulating clean, crystal-clear water that helps maintain a tidy tank interior.\u003c\/p\u003e\n\u003cp\u003eWith fewer moving parts than many modern setups, this design emphasizes straightforward maintenance. It supports both freshwater and saltwater aquariums, offering an approachable way to sustain a balanced, aerated environment without clutter.\u003c\/p\u003e\n\u003ch3\u003eHow it filters and aerates\u003c\/h3\u003e\n\u003cp\u003eThe filtration shines through a combined biological, chemical, and physical approach. Air pushed through air stones rises along lift tubes, drawing water through gravel, then through the filter plates and Filt-a-Carb activated carbon cartridges. Over time, beneficial bacteria colonize the gravel and plates, contributing to clearer water.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBiological filtration supports bacteria colonies on gravel and plates.\u003c\/li\u003e\n  \u003cli\u003eChemical filtration via carbon cartridges helps reduce odors and dissolved impurities.\u003c\/li\u003e\n  \u003cli\u003ePhysical filtration captures debris as water passes through gravel and media media.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAeration and overall system design\u003c\/h3\u003e\n\u003cp\u003eBecause the unit is air-driven with an external pump (not included) and air stones, it also aerates the water, creating oxygen exchange without adding visual clutter. It’s effectively a filter and bubbler in one.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eQuiet operation with minimal moving parts for easier upkeep.\u003c\/li\u003e\n  \u003cli\u003eFits most 15-20 gallon high tanks, freshwater or saltwater.\u003c\/li\u003e\n  \u003cli\u003eIncludes 2 filter plates, 2 adjustable lift tubes, 2 airline tubes, 3 connectors, and 2 carbon cartridges.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat’s included and practical details\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2 Filter Plates\u003c\/li\u003e\n  \u003cli\u003e2 Adjustable Lift Tubes\u003c\/li\u003e\n  \u003cli\u003e2 Straight Airline Tubes\u003c\/li\u003e\n  \u003cli\u003e3 Filter Plate Connectors\u003c\/li\u003e\n  \u003cli\u003e2 Replaceable Filt-a-Carb Carbon Cartridges\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEach filter plate measures about 11.25 in. by 11.2 in., and together they span roughly 22.5 in. wide. Lift tubes extend from 12 to 15 in. to accommodate gravel beds and tank depth. Color variations may occur, adding a natural variation to your tank’s interior.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What tank size is this filter designed for?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Designed for most 15-20 gallon high tanks, suitable for freshwater and saltwater setups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the filter aerate the water as it runs?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It’s air-driven and uses air stones to aerate while filtering.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Penn-Plax","offers":[{"title":"Default Title","offer_id":40564739768449,"sku":"B0002AQ1SI","price":63.42,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0598\/4757\/3633\/files\/penn-plax-undergravel-filter-plates.jpg?v=1765940388","url":"https:\/\/petiva.ca\/products\/penn-plax-undergravel-aquarium-filter-for-15-20-gallon-tanks-clear-free-premium-ugfs","provider":"Petiva","version":"1.0","type":"link"}