The filter and the filter valve (multiport or slide) could have broken internal parts which have lodged themselves inside of a pipe or fitting. There could also be a closed return valve or bypass valve after the filter, causing the pressure to rise to very high levels. If your pressure is much higher than that, there could be a foreign substance in the filter (paper products, plastics, mulch, oils) that is really clogging it up. They say to backwash your filter (or clean your cartridges) when the pressure rises 8 lbs above the clean, start-up pressure. If your pressure is higher than normal, this usually indicates a dirty pool filter. Or, the pump may have an air leak, and is drawing in more air than water, which will also reduce the filter pressure (and filtration). It could also be a closed or broken valve before the pump. It could be a clogged pump basket, clogged impeller, clogged pipe or clogged skimmer.
If the water is not moving through the filter at a normal rate, there is a clog or obstruction, before the pool filter. $8 pool filter gauges are cheap instruments that will fail in time you may want to keep a spare gauge on hand. Run a stick or small screwdriver down into the hole to clear out any clogs from debris that can block the pressure gauge or air relief assembly. To check, shut the pump off and remove the pressure gauge with pliers or a small wrench. If you are certain that water is moving through the filter at a normal rate, either the gauge has failed, or there is a clog within the air bleeder assembly that the gauge screws into. Inspect the gauge dial or face for warping, which can prevent the dial from moving. Give the gauge face a flick – with your fingernail to see if it pops up. If the filter pressure gauge reads zero or close to zero with the pump running and the valve in filter or backwash mode, something is wrong. When the pump is off, or the valve is set to recirculate or drain to waste, the filter pressure should be zero.
Here’s a list of common pool filter problems, and suggested solutions that you can try. Check other equipment for anything that could be obstructing water flow – to and from the pool filter. Clogged or closed pool skimmers, pump or valves can all cause pool filter problems. Pool filter trouble can take many forms, and not all issues with filtration are filter problems.
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Sit down grasshopper, have a cup of tea, and free your mind from worry. So – your pool filter is having problems, and you are seeking answers.