Using your Fluval Water Polishing Pad is easy. First, make sure your Fluval Canister Filter is turned off. Then, open the filter and place the pad in the designated area as per the filter's instructions. Turn the filter back on, and it'll start working right away to clear up your water. When it comes to maintenance, check the pad regularly. If it looks dirty or clogged, it's time to replace it. For best results, replace the pad every few weeks, depending on how dirty your tank gets. Keep in mind that these pads are designed for Fluval Canister Filters only, so don't try to use them in other types of filters. And always handle the pads gently to avoid damaging them.