how to tell if pool filter is clogged


Author: PoolKing - Pool Sand Filter Manufacturers

How to Tell if Pool Filter is Clogged

Swimming pools are a refreshing source of summer entertainment and relaxation. However, to keep the water clear and clean, regular pool maintenance is essential, and part of that maintenance is keeping the filter well-maintained. The filter is a vital component of the pool system and is responsible for trapping and removing dirt, debris, and algae that would otherwise make the water murky and unappealing. Unfortunately, pool filters can become clogged over time, which can decrease their effectiveness and end up costing pool owners more money in energy bills and chemicals. This article will explore how to tell if the pool filter is clogged and what steps to take to fix the issue.

Signs of a Clogged Pool Filter

There are a few tell-tale signs that the pool filter is clogged and not functioning correctly, including:

1. Slow Water Flow: One of the most noticeable signs of a clogged pool filter is slow water flow. If the water is taking too long to return to the pool, it is likely that the pump and filter are not working efficiently, and it may be time to inspect and clean the filter.

2. Dirty Water: Another visible sign of a clogged filter is dirty water. If debris is present in the pool and the water looks cloudy or murky, it is possible that the filter is clogged and not catching all of the dirt and debris that it should be.

3. Increased Pressure: When a filter is clogged, the pressure inside the filter can increase, which can cause it to become damaged or even rupture. An increase in pressure can also cause the pump motor to work harder, leading to increased energy costs.

4. Noisy Filter: If the pump motor sounds louder than usual or makes unusual noises, it could be a sign that the pool filter is clogged, and the pump motor is working harder to push the water through the filter.

5. Short Filter Runs: When a pool filter is clogged, it may cause the pump motor to overheat, which can lead to it shutting off prematurely. If the filter is not running for its usual length of time and is turning off frequently, it could be a sign of a clogged filter.

How to Fix a Clogged Pool Filter

If you notice any of the above signs of a clogged pool filter, it is crucial to act quickly and clean the filter. Here are some steps to follow:

1. Turn off the Pump: Before attempting to clean the filter, always turn off the pump to avoid any accidents or damage to the pool equipment.

2. Remove Debris: Remove any visible debris from the skimmer basket and the pump basket to ensure that the filter is not clogged by large objects.

3. Backwash the Filter: In some cases, backwashing the filter may be enough to clear out any debris that is clogging it. Turn the pump back on and run the filter on the "backwash" setting for a few minutes to flush out the filter.

4. Deep Clean the Filter: If backwashing does not solve the issue, it may be time for a deep clean. Remove the filter and soak it in a solution of water and filter cleaner or vinegar for several hours or overnight.

5. Replace the Filter: If the filter is too old or damaged, it may be time to replace it entirely. Make sure to choose a filter that is compatible with the pool system and that has the correct flow rate.

Maintaining a Clog-Free Pool Filter

Prevention is always better than cure, and the same concept applies to pool maintenance. Keeping the pool clean and maintaining optimal chemical and water balance can reduce the chances of a clogged filter. Regular backwashing, periodic deep cleaning, and replacing the filter regularly can also help extend the life of the filter and keep the pool water crystal clear.


A clogged pool filter can be frustrating and costly, affecting the water quality and possibly leading to higher energy costs. Luckily, it is not difficult to identify the signs of a clogged pool filter, and the steps to clean or replace it are also straightforward. Regular pool maintenance can help prevent the filter from clogging, making it easier to keep the pool clean, sanitized, and refreshingly inviting.


Just tell us your requirements, we can do more than you can imagine.
Send your inquiry

Send your inquiry

Choose a different language
Current language:English