A sponge filter is little more than a piece of foam that sits inside your aquarium and filters your water. No, seriously – it’s as simple as that! While sponge filter designs vary from brand to brand, they are typically made up of four different parts: Different parts of a sponge filter diagram 1. Foam sponge – It wouldn’t be a sponge filter without it. 2. Weighted base – Stops the sponge filter from floating around your tank. The sponge sits on top of this base. 3. Strainer and bulls eye–Slides inside the sponge and allows you to connect airline tubing directly to the filter. 4. Lift tube – Water flows up this and back into your tank. While it may not look like much, these four parts actually form a very effective filter. As for how a sponge filter works, well, it’s very clever… How a sponge filter works diagram With a good air pump attached, bubbles rise up the lift tube and out into your tank. This forces water to be drawn through the foam sponge. As water passes...
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