Cartridge Filter

Also Known As:

Used as barrier to or for sifting sediments, a cartridge filter is designed to clean debris from pool water. It may filter microorganisms or simply block larger solids. Located in a housing near the pump, the cartridge itself is typically cylindrical.

The pump circulates water through the filter at a rate of one gallon per minute. The pool water should be completely filtered in a maximum of 12 hours or less dependent of pool type and local code. Therefore, the size of the cartridge filter depends on the size of the pool. When the pressure in the tank increases, the flow decreases and the filter may be clogged and under performing. However if filtration is poor but the pressure remains steady, it may be time to replace the cartridge filter because it is torn or worn out.

Most cartridge filters are designed for reuse, saving money. Simply remove it from its housing, degrease using Tri-Sodium Phosphate (TSP), soak the grids and hose the cartridge off. In some systems, the cartridge filter can be backwashed; however, this is not typically as effective. The filter should be cleaned at least once or twice per season.

The filter itself is made of a replaceable porous element, usually paper or polyester. A filter with a large surface area requires less maintenance. When filters become brittle, they should be replaced.