<b> Features: </b><br> Generic pads for SUNSUN Canister filters HW-304B/404B/704B, HW-3000, Polar Aurora 525gph, Aquatop CF-500. <br> 4 pcs of sponge bio filter pads (1xCoarse, 2xMedium, 1xFine): trap most visible debris particles without restricting water flow. (Reusable after rinsed) <br> 12 pcs of white floss pads: Filter out fine particles providing crystal clear water. <br> <b>Dimension: </b><br>8.5”x8.5”x0.79” (L x W x H)<br> <b> Tips for Usage and Maintenance: </b><br> Maintenance of Sponges: <br> The sponge will need to be rinsed every time it becomes dirty, about once every 1 to 4 weeks. <br> After 6 to 12 months’ usage, the micro holes of sponge are gradually clogged by the tiny debris. So it is also recommended to replace the sponge once 6 to 12 months or when the sponge gets worn out. <br>