The filter removes insoluble particles that can cloud water. Having the proper size filter for your pool is critical to keep water clean, too big and water does not filter properly, too small and the filter could get clogged easily.
There are 3 types of filters that pool owners might use:
Regardless of the type of filter, normal maintenance is required and always involves two steps. Step one: Physical cleaning to remove loose debris and step two: Chemical cleaning to remove oils and stubborn debris.