Pool Pump Strainer Basket: What to Check

What the strainer basket does

The strainer basket is the removable plastic container inside the pump's hair and lint pot, just before the impeller. Its job is to catch leaves, grass, and other debris that the skimmer missed, keeping that material away from the impeller and the rest of the pump. In a pool pump listing, you will see it named as the strainer basket, the pump basket, or sometimes the hair and lint basket.

The basket sits behind a clear or translucent lid, so you can see when it is full without opening the pump. When the basket fills up, water has to squeeze around the debris, which reduces the flow through the pump. That is why the maker's manual will tell you to empty the basket regularly, usually whenever you empty the skimmer basket or when the pump's flow looks weaker.

This article explains how to inspect the basket and when to replace it. It does not cover cleaning the impeller or opening the pump housing; those steps are in the maker's manual and are outside the scope of this buying guide. For more on pump flow, see how to read flow rate.

How to inspect the basket

To inspect the basket, turn off the pump first. Then twist the lid counterclockwise and lift it off. The basket lifts straight out by its handle. Rinse it with a garden hose to remove debris, and then hold it up to the light.

Look for these signs of wear:

• Cracks or splits in the plastic, especially around the handle or the bottom rim.
• Warping, so the basket no longer sits flat or the lid does not seal evenly.
• Torn or stretched mesh, if the basket has a fine mesh section.
• Worn or melted edges where the basket meets the pump housing.
• Debris stuck in the holes that does not rinse out.

When to replace the basket

Replace the basket if you find any cracks, warping, or torn mesh. A damaged basket lets debris slip past the impeller, which can reduce flow and put extra load on the pump motor. Even a small crack can grow over time, especially in sunlight or when the pump runs warm.

Also replace the basket if it no longer seats snugly in the pump housing. A loose basket can vibrate or let debris bypass it. If the lid does not seal because the basket sits too high, the pump may draw air, which reduces priming and flow.

The basket is a wear item, not a lifetime part. Most pump makers sell replacement baskets for each model, and the part number is usually printed on the basket itself or in the manual. Keep a spare on hand so you can swap it out without waiting for shipping. When shopping for a new pump, consider models with a clear lid so you can monitor the basket easily; see the best inground pool pumps for examples.

Checking the lid and O-ring

While the basket is out, inspect the lid and the O-ring that seals it. The O-ring should be flexible and free of cracks or flat spots. A worn O-ring can let air into the pump, which makes priming harder and reduces flow.

Clean the O-ring with a damp cloth and, if the manual calls for it, apply a thin coat of pool-safe lubricant. Do not use petroleum jelly; the maker's manual will specify the right lubricant. If the O-ring is hard, cracked, or stretched, replace it with the maker's part.

The lid itself should close smoothly and latch without forcing. If the lid is cracked or the threads are damaged, replace the lid as well. A cracked lid can leak air or water, so it is worth checking each time you empty the basket. For more on the lid and basket assembly, see the basket lid article.

Basket care and replacement parts

To make the basket last, rinse it after emptying and let it dry before storing it for the winter. Do not leave it in direct sunlight for long periods, as UV light can make the plastic brittle. When you buy a replacement, match the part number to your pump model; a basket from a different model may not seat correctly.

In a pump listing, the strainer basket is often included with the pump, but some listings sell the basket separately as a replacement part. If you are buying a pump, check whether the basket is included and whether the listing states the basket material. Most baskets are made of molded plastic, and some have a fine mesh section for smaller debris.

The basket is not the same as the skimmer basket in the pool wall. The skimmer basket catches large debris before it reaches the pump, while the strainer basket catches what gets past the skimmer. Both need regular emptying, but they are separate parts with separate part numbers. If you are comparing pumps, look for models with a large basket opening for easier cleaning; the best above ground pool pumps often list this detail.

What this site cannot say

This site compares pool pumps on their stated details, not on how well a basket performs in a specific pool. The site cannot tell you how often to empty the basket for your pool, because that depends on debris load, pump run time, and pool size. The maker's manual and the pump's flow rate will guide you.

The site also cannot advise on pump repair or disassembly beyond removing the basket. If the pump loses prime, makes noise, or shows low flow after you have cleaned the basket, the cause may be elsewhere, such as a clogged impeller or a worn seal. Those repairs are for a qualified technician or the maker's service instructions.

For pool safety around drains and suction outlets, the Pool Safely program from the U.S. Consumer Product Safety Commission provides guidance. This article does not cover drain safety or entrapment prevention. For more on pump maintenance and what to check, see the summer maintenance article.

What to pick for your situation

Questions

How often should you empty the pool pump strainer basket?

Empty it whenever you empty the skimmer basket, or when the pump's flow looks weaker. The maker's manual will give a schedule, but a good habit is to check it each time you run the pump.

Can you run the pump without the strainer basket?

No. The basket protects the impeller from debris. Running without it can let leaves and twigs reach the impeller, which can reduce flow and damage the pump.

How do you know if the strainer basket is cracked?

Hold it up to the light and look for hairline cracks, especially around the handle and bottom rim. If you see any crack, replace the basket.

Is the strainer basket the same as the skimmer basket?

No. The skimmer basket sits in the pool wall and catches large debris. The strainer basket sits inside the pump and catches what gets past the skimmer.

Can you use a basket from another pump model?

Only if the part number matches your pump. A basket from a different model may not seat correctly, which can let debris bypass it or cause the lid to leak.