Filters are used to remove insoluble matter from your pool or spa. Cartridge filters are one of the types of filters used. Over time the accumulation of dirt on the filter cartridge results in the slow-down of the turnover rate making it unacceptable for keeping the pool water safe. The cartridge can be removed and cleaned to remove most of the dirt. Over a period of time the little bit of dirt not removed with each cleaning clogs the pores of the filter and the cartridge needs to be replaced.
If you have not replaced your cartridges in your pool in the past year or in your spa in the past 3-6 months, you should get yourself some new cartridges. Use the numbers from the old cartridge or measure the size of the old cartridge to find the one you need.
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