Step-by-Step Guide on Cleaning a Pool Filter Without Damaging It
Cleaning a pool filter is not a one-size-fits-all procedure. Attempting to backwash a cartridge filter or pressure-wash a D.E. grid will result in immediate, costly destruction of the equipment. Because the filter is the single most important component for water clarity, maintaining it correctly is vital. This comprehensive, step-by-step tutorial outlines the exact, safe methods for chemically and physically cleaning the three major pool filter systems.
Universal Safety Step: Depressurize the System
Before touching any clamps, lids, or valves on your filtration system, you must turn off the pool pump at the breaker. A pool filter operates under immense hydrostatic pressure. Attempting to open a filter tank while the pump is running can cause the heavy lid to blow off explosively, resulting in severe injury. Once the power is off, open the air relief valve on top of the tank to release all trapped air and depressurize the vessel.
How to Clean a Cartridge Filter Step-by-Step
Cartridge filters utilize delicate pleated fabric to trap microscopic dirt. They must be handled gently to prevent tearing.
1. Remove the Cartridges
Unscrew the tank clamp, remove the heavy lid, and carefully lift the cylindrical cartridges out of their manifold base. Place them upright on a concrete driveway or grass area where dirty water can safely drain.
2. Hose Down the Pleats
Attach a standard spray nozzle to your garden hose. Starting from the very top, spray the water at a 45-degree angle downward into the pleats. Work your way around the cylinder, pushing the dirt down and out of the fabric. Never use a stiff brush or a pressure washer, as both will destroy the micro-pores in the polyester material.
3. The Chemical Soak (Biannual Requirement)
If water alone isn’t removing the dark, sticky grime, the filter is coated in body oils, cosmetics, or calcium scale. Fill a large plastic trash can with water and a specialized pool filter cleaner (or a mixture of water and diluted muriatic acid for scale). Submerge the cartridges completely and let them soak for 12 to 24 hours. Rinse thoroughly before reinstalling.
How to Chemically Clean a Sand Filter
While regular backwashing flushes loose dirt out to waste, it does not remove heavy grease or calcification that causes the sand grains to clump together (channeling). You must chemically clean the sand bed twice a year.
1. Initiate the Backwash
Turn the pump off, move the multiport valve to ‘Backwash’, and turn the pump back on.
2. Add the Sand Filter Cleaner
While the pump is running in backwash mode, slowly pour a bottle of liquid sand filter cleaner directly into the pool skimmer basket. The suction will pull the chemical directly into the sand tank.
3. Soak the Sand Bed
As soon as you see the cleaner entering the sight glass (it may look sudsy or colored), turn the pump OFF immediately. Let the chemical sit undisturbed inside the sand tank for 12 to 24 hours. This allows the acid and enzymes to break down the hardened grease and calcium.
4. Flush the System
After the soaking period, turn the pump back on (still in the Backwash setting). Run it for 5 solid minutes to blast all the dissolved gunk out to the waste line. Finish with a 1-minute ‘Rinse’ setting, then return to ‘Filter’.
Cleaning the Multiport Valve (Spider Gasket)
If you have a sand or D.E. filter, the multiport valve on top handles the directional flow. Over time, the rubber ‘spider gasket’ inside the valve can degrade or become unseated, causing water to leak continuously out of the waste line even when set to ‘Filter’. When performing your annual filter cleaning, unscrew the valve top, inspect the rubber gasket for tears, lubricate it with a Teflon-based pool lube (never petroleum jelly), and reassemble.
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