why does my pool filter keep getting air in it


Author: Poolking - Swimming Pool Equipment Manufacturer

Why Does My Pool Filter Keep Getting Air In It?

If you have a pool, then you know the importance of keeping the water clean and safe. A pool filter is crucial in maintaining the pool's cleanliness, but what if it constantly gets air in it? If you’re experiencing this problem, then you’ve come to the right place.

In this article, we’ll cover the causes of air in pool filters, the potential damage it can cause, and methods to fix it.

Causes of Air in Pool Filters

1. Leaking Equipment

Leaky pool equipment, such as the pump or filter, is one of the primary causes of air in the pool filter. If these parts are damaged, water and air will leak out from the cracks, which can prevent the pool from functioning correctly.

2. Poor Water Level

Water level also plays a crucial role in pool performance. If the pool water level is too low, not enough water can flow into the filter, resulting in air entering the filter instead. To ensure optimal performance, ensure that the water level is high enough to cover the pool skimmers' opening.

3. Clogged Skimmers

If the skimmer basket is clogged with debris such as leaves, twigs, or other foreign particles, it can limit the amount of water entering the filter. When the basket is clogged, water has no clear path to flow to the filter; hence air enters the pool filter.

4. Air Vacuum

When air trapped in the filtration system cannot escape, it can create a vacuum in the system, leading to air-filled pool filters. This happens when the pool system goes partially empty, and the filter remains filled with air.

The Potential Damage Caused by Air in Pool Filters

Air in the pool filter can create a pool system imbalance with adverse consequences. Below are some of the potential damage caused by increased air in the pool filter.

1. Inadequate Water Flow and Suction

The pool pump relies on water flow to operate correctly. If air enters the pool filter, it can disrupt the water flow or suction, ultimately preventing the pump from working, causing inadequate water circulation, stagnant water or clogging the pump.

2. Damage to the Pool Equipment

If the air in the filter persists, it can damage the pool equipment. For example, low water levels and air-filled filters can increase the pump’s strain, leading to premature failure, which in the long play leads to costly repairs.

3. Algae and Bacteria Build-Up

Inadequate water flow and suction create the perfect environment for algae and bacteria to thrive, and without proper filtration, these organisms will enter the pool resulting in hazy water, foul smell and cause skin and eye irritation to pool users.

Methods to Fix Air in Pool Filters

Now that we know what causes air in pool filters, it’s essential to have some solutions to fix it. Depending on the problem’s cause, some solutions may work better than others. Below are some of the solutions to fix air in pool filters.

1. Check for Leaks

If you notice air in your pool filter, the first thing you should do is check the entire pool equipment for leaks. Visible cracks or damage could indicate where the air is entering. Once you locate the culprit, repair or replace it immediately.

2. Clean the Skimmer Basket

Cleaning the skimmer basket is an effortless solution to the clogged skimmers, and it’s advisable to check the basket frequently to prevent debris build-up. Once you’ve cleaned the skimmer basket, check the filter again to see whether the air issue is resolved.

3. Adjust Water Level

Suppose the pool water level is too low. Add water to the pool by using a garden hose. Increasing water levels can help ensure that water flows into the filter and prevent the entry of air.

4. Check the Pump Lid

The pump lid is another crucial part of the pool equipment that warrants attention. It ensures that water flows through to the filter and prevents air from entering. If the pump lid gasket is damaged, air can enter the filtration system, causing problems. Replace the gasket, and it should resolve the issue.

5. Air Vacuum Release Valve

An air vacuum release valve can resolve any vacuum caused by the pool system that traps air in the filter. It works by opening the valve to release any trapped air. Once the valve releases air, it resolves the pool filter problems.


If your pool filter continues to encounter air, it’s essential to figure out the cause and fix it before it causes problems. A well-maintained pool with high water levels and adequately functioning equipment will save you cost on repairs and ensure a safe and enjoyable swimming experience.


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