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5 Reasons Why Your Pool Filter Isn’t Working

With great warmth comes great responsibility for pool owners.

With May finally here, the outdoor pool season is upon us and brings with it a great deal of fun in the sun, but also its share of extra work.

Pool owners will know that properly functioning filters are essential to help keep their pool clean, safe and free of any sort dirt, debris or other annoyances.

But what happens when your pool filter isn’t working properly?

Simply put, there risk of you and your family being exposed to unclean water is greatly increased as is potential expensive damage to your pool system, particularly the pipes and other infrastructure.

What are the signs of a failing filter?

The most obvious indicator that your filter isn’t functioning properly is that your pool water does not appear to be as clean as it should.

Mechanical deficiencies such as leaking or unusual noises are other common occurrences that tend to accompany dysfunctional filters.

5 Reasons Why Your Pool Filter Isn’t Working

  1. Blockages/Obstructions: Deviations in your pool filter pressure gauge generally indicate some form of blockage or obstruction in the system.  Have a look at both your filter and return line to be sure there is nothing in the way. Regular backwashing can generally help prevent these issues, but in certain cases a more comprehensive cleaning of your machinery (strainer basket, impeller, pool skimmer basket etc) will be required.


  1. Mechanical Breakdowns: Sometimes mechanical parts fail and your pool filtering system is no exception to this rule. If you notice filter material in your pool (sand or otherwise) this is often a sign of a broken or damaged part in your system which will require replacement.  Consult your owner’s manual to learn more about this process while keeping in mind that very often replacing your filter cartridges or grids will solve a number of common issues.


  1. Your filter or pump are the incorrect size:   If your filter does not match the size of your pump, it will lead to pressure build ups resulting from the filter being forced to push more water than it can handle.  This may require switching to a larger filter, or alternatively, a smaller pump.


  1. Imbalanced water chemistry: If your chlorine levels are not sufficient, algae overgrowth could occur which leads to filter clogging. If you find your filter running shorter cycles, this could be the cause. Check your water chemistry regularly to help prevent or, at the very least, identify this issue.


  1. Leaks: Leaks are a common problem that should be easy to identify but that may not cause any immediate system symptoms.  Take the time to examine your pool infrastructure for leaks regularly and know that it is in your best interest to address a leak sooner, rather than later.


In addition to some of the tips shared here today, when it comes to identifying and remedying pool-related issues, your owner’s handbook is probably your best friend. If that fails you, don’t hesitate to use the directory to find a pool specialist that you can trust for further guidance and support.

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