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Polyester Felt Filter SockAre you looking to extend the life of your filter and increase water quality and clarity in your aquarium, koi pond, reef tank? If so, our felt filter sock is for you!Remove any unwanted debris, contaminants or particles that are causing your fish tank to be anything other than perfect, by simply placing this in the sump of your aquarium.Sumpsock!We care about the health of your fish or aquatic life and it is our mission to help contribute to longer, healthier lives. It's a simple, cost effective, eco-friendly, reusable change that provides major benefits.Multipurpose Use!Generally, these bags are meant to be thrown away after they are clogged. Polyester has an excellent rating with water, vegetable oils from animals and plants, petro-oils, organic solvents and micro-organisms. Polyester has a good rating with Alkalis, Organic acids, mineral acids and oxidizing acids, pools, drinking water, honey, beeswax, maple syrup, cold brew coffee, cooking oil, biodiesel, transmission fluid and much more.Features:Polyester Felt5 Micron Rated7" x 16"Carbon Steel Support RingHanging StrapSinged for StrengthReusable