Complete Pool Filter Maintenance: More Than Just Cleaning
When most pool owners think of pool filter maintenance, they immediately think of washing the cartridges or backwashing the sand. While cleaning the filter media is essential, it is only half the battle. A pool filter is a highly pressurized vessel with multiple mechanical components that can fail, leak, or degrade over time. Comprehensive maintenance ensures that your filter system operates safely, efficiently, and lasts for years without requiring an expensive total replacement.
Inspecting and Lubricating O-Rings
The biggest enemy of a pool filter is an air leak. Air entering the system destroys pump efficiency, drops water levels, and creates dangerous pressure buildup. The primary seals preventing these leaks are thick rubber O-rings located under the filter lid, on the pump lid, and inside the valves.
- Twice a year, remove the main tank O-ring.
- Wipe it completely clean with a soft cloth to remove grit and sand.
- Inspect the rubber for dry rot, cracking, or flattening.
- Apply a generous coat of Teflon-based or silicone-based pool lubricant. NEVER use petroleum jelly (like Vaseline), as it will melt and permanently ruin the rubber.
Maintaining the Multiport Valve
If you have a sand or D.E. filter, the multiport valve is the control center. Inside this valve is a spoke-shaped piece of rubber called the spider gasket. If this gasket tears, water will continuously leak out of the waste pipe, slowly draining your pool.
- Always turn the pump off before moving the multiport valve handle. Moving it while under pressure will instantly tear the spider gasket.
- Always turn the handle in one consistent direction (clockwise) to reduce wear on the spring and gasket.
Checking the Pressure Gauge and Air Relief Valve
The pressure gauge is your only window into the health of your filter. If the gauge is broken—stuck at zero, filled with water, or never drops when the pump is off—you are flying blind. Replace a broken gauge immediately; they are inexpensive and screw right into the top of the tank.
Next to the gauge is the air relief valve. After every cleaning, you must open this valve while the pump primes to bleed the trapped air out of the tank. If this valve becomes clogged with dirt or calcium, it will not close properly, leading to a constant water leak.
Winterizing Your Filter System
If you live in a climate where it drops below freezing, winterizing your filter is the most critical maintenance task of the year. Water left inside the tank or valves will freeze, expand, and crack the fiberglass or plastic housing, ruining the unit entirely.
- Remove the drain plug at the very bottom of the tank and leave it off all winter.
- Move the multiport valve handle to the ‘Winter’ or ‘Closed’ setting, or leave it halfway between settings to prevent the internal spring from seizing.
- Take cartridge filters out and store them indoors.
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