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Sludge valves on bead filters are usually a ball valve on a piece of 1" pvc. This pipe will freeze easily if your bead is outside all winter with a running pump attached to it. The easy fix is to keep a light on near it all winter or at least when it is cold. The heat from the light will keep it warm enough so it doesn't freeze. If you shut your pumps down then be sure to drain all your lines as well as your filters. You might want to crack open the sludge drain on an empty bead filter thats outside for the winter as it doesn't take much water to freeze and crack that drain..
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