5D/6D Filter Sponge Precision Activated Carbon Fungus Cultivation Bio-Chemical Absorbent Sponge Filter Pad for Aquarium. Description: This filter foam is thick, durable, reusable after cleaning, can be cut to any size you need, and its dense shape makes it effective in avoiding residue. The bio-chemical filter is optimal for breaking down excreta and leftover grass, and its porous nature prevents clogging and provides maximum attachment area for bacteria. It is made of high-quality filter cotton and mesh cloth material. There are 4 styles for you to choose from. It is mainly used in fish tanks and aquariums. Item Name: Filter Sponge Material: Filter Cotton, Mesh Cloth Features: Useful, Thickening, High Density Style 1: 5D Filter Sponge Style 2: 6D Filter Sponge Size Details: Size S: 50cm x 11cm/19.69" x 4.33" (Approx.) Size M: 50cm x 30cm/19.69" x 11.81" (Approx.) 5D Filter Sponge Height: 1cm/0.39" (Approx.) 6D Filter Sponge Height: 2cm/0.79" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Product Description: 1. This product is suitable for seawater tank, freshwater tank, aquascape. 2. High density pore gap and softness, good filtration effect. 3. Please use fish tank water(no chlorine water)to clean this product. Suggestion: Filter cotton is dirty to be cleaned in time to keep the filtering environment clean, wash several times after the fibers loose need to be replaced to ensure the filtering effect. Package Includes: 1 x Filter Sponge