why doesn't my pool filter have pressure

2023/11/01

Pool ownership comes with a fair number of chores one of which is regularly checking the filters. If your pool filter has lost pressure lately, you might have a problem on your hands. A properly functioning filter is an essential component to keeping your pool crystal clear and healthy to swim in.


Before heading to the pool supply store for a new filter, it's essential to understand the common reasons for low pressure. There are several culprits that are known to reduce pressure in a pool filter, and this article will explore five of them.


Dirty filter

A dirty filter is likely the most common reason for low filter pressure. It's not uncommon to see a filter's pressure rise by 1 PSI in a day or two, due to the accumulation of dirt and debris in the filter. If the pressure rises by more than that, it's time to clean or replace the filter. Typically, the pressure should read between 10-20 PSI, so if the reading is significantly lower, it is time to take action.


Damaged o-rings

Your filter's o-rings seal the joint between the filter and its piping. If the o-ring fails, water might leak out of the filter, causing low water pressure. Over time, filters that are exposed to the sun or have calcium buildup can degrade the o-ring. If you suspect that a damaged o-ring is the cause of the low pressure, observe the filter for leaks or double-check the placement of the o-ring.


Plumbing issue

A problem in the pool's plumbing system can create a blockage, and that blockage reduces water flow. A plumbing issue might be localized or widespread. If only one skimmer is affected, it suggests a blockage in the plumbing line between the skimmer and the filter. On the other hand, if several parts of the pool's plumbing system are producing low pressure, it's a big problem that requires immediate attention.


Broken pump impeller

Your pump's impeller spins along with the motor to move water through the filter. If the impeller becomes damaged, it will not move water through the filter effectively, and the water pressure in the filter will drop substantially. It's usually easy to tell if the impeller is broken as it will not be spinning.


Underground leak

Low filter pressure could be a result of an underground leak that's draining water from the filter. This is a less common problem than the others on this list, but it should still be taken seriously. Check the pool for visible leakage, and keep an eye on the water level after adding more water. If the water consistently falls lower than expected, then it’s a warning sign that there is an underground leak.


In conclusion, pool filter pressure is one of the most critical components for maintaining a healthy pool. If you suspect that your pool filter has low pressure, it’s important to investigate the cause and take swift action to address the issue. If you cannot find a solution, contact a pool professional for assistance. Maintaining proper filter pressure is crucial to getting the most out of your pool equipment, so don't overlook the warning signs.

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