Q. How do I know when it’s time to clean my swimming pool filter?
A. When a brand new filter, filter elements, or sand is installed on a pool and the system is first started up, you should take note of the pressure gage at the top of the filter and make note of that number. When the filter pressure rises more than 10 lbs. above that number it is time to backwash or clean your filters. Since the hydraulics of every pool are different, that starting number will be different on every pool.
After you have cleaned or backwashed the filters the pressure gage should read at it’s original starting position. You may find that your filters need to be cleaned as often as once a week, or sometimes as little as once a year, depending on the type of filter, water, climate, etc. The pressure gage should determine the amount of time between cleanings, not the calendar. If you have to clean your filters too often (more than once a week), it’s likely time to replace your filter media entirely.
Of course our advice is particularly gaged for swimming pool owners along the Wasatch Front in Utah.