A filter that uses graduated sand layers as a filter medium. Product specifications are assumed to be accurate at the time of original publication. You can choose to get a heat pump with a cooler function. This disassembly process also allows you to check if regular backwashing has removed too much sand. Most sand filters should be filled with about two-thirds with sand and have a third freeboard. Rewind after adding new sand to remove dust and impurities from the new sand. When water enters the grate and flows out, any residue in the pool water will clog the inside of the grates, rendering them useless. Do not rewind a…