How to Fix Pool Pumps That Keep Losing Pressure

A pool pump that keeps losing pressure can be a frustrating problem for pool owners. A loss of pressure can lead to inefficient filtration, dirty water, and a less-than-optimal pool experience. Understanding the causes of low pool pump pressure and knowing how to address them is crucial for maintaining a healthy and well-functioning pool. In this blog post, we’ll go over some common causes of low pressure in pool pumps, how to diagnose the issue, and practical steps you can take to fix it.

Why is Pool Pump Pressure Important?

Pool pump pressure plays a crucial role in the proper circulation and filtration of your pool water. Without adequate pressure, the pump cannot circulate water through the filtration system, which can result in:

Dirty water: If water isn’t circulating properly, dirt, debris, and contaminants remain in the pool, affecting water clarity and quality.
Inefficient filtration: The pump’s primary job is to push water through the filter. Low pressure means the filter isn’t working effectively to clean the water.
Strain on equipment: Low pressure can put a strain on the pump and filtration system, potentially leading to equipment damage or failure.

Maintaining proper pressure ensures that your pool water is clean, clear, and safe for swimming.

Common Causes of Pool Pump Pressure Loss

Several factors can contribute to a pool pump losing pressure. Understanding these causes is the first step in diagnosing and fixing the problem.

1. Clogged or Dirty Pool Filter

One of the most common reasons for low pool pump pressure is a clogged or dirty filter. Over time, debris and particles can accumulate in the filter, restricting water flow and reducing pressure.

Signs of a dirty filter: If your pool water is cloudy, you notice a significant drop in water pressure, or the filter feels very dirty to the touch, these are signs that the filter may be clogged.
Fix: Clean or replace the filter depending on the type of filter you have (sand, cartridge, or DE). Cleaning the filter involves backwashing for sand filters or rinsing and cleaning the cartridges for cartridge filters.

2. Blockages in the Skimmer or Pump Basket

Debris can accumulate in the skimmer or pump basket, which can obstruct water flow and reduce the pressure in the system.

Signs of blockages: If your skimmer basket or pump basket is full of debris, you may notice a drop in pressure or the pump making a strange noise.
Fix: Regularly clean the skimmer and pump baskets by removing any debris. This should be done at least once a week or more often if your pool is in a debris-prone area.

3. Air Leaks in the Pump System

Air leaks in the pump system can cause a drop in pressure by allowing air to enter the pump and disrupt the water flow.

Signs of an air leak: If you see air bubbles in the pool or hear a hissing noise around the pump, it may be an indication of an air leak.
Fix: Inspect the pump and plumbing connections for any visible cracks or loose fittings. Tighten or replace any damaged parts to prevent air from entering the system.

4. Closed or Partially Closed Valves

Sometimes, valves that control water flow in and out of the pump can become closed or partially closed, restricting water flow and causing low pressure.

Signs of valve issues: Low pressure accompanied by a sudden drop in water flow may indicate a closed valve.
Fix: Check the valves on the pump system and make sure they are fully open. If necessary, replace any malfunctioning valves.

5. Clogged Return Lines

The return lines carry water back into the pool after it’s been filtered. If these lines become clogged with debris or buildup, it can restrict water flow and cause a loss of pressure.

Signs of clogged return lines: If water isn’t flowing properly from the returns or you notice a decrease in pressure, clogged return lines could be the culprit.
Fix: Inspect the return lines for blockages. Use a pool vacuum or plumbing snake to clear any debris. If the clog persists, you may need to hire a professional to check for deeper blockages.

6. Faulty Pump Impeller

The pump impeller is responsible for moving water through the pump. If the impeller becomes clogged or damaged, it can reduce water flow and pressure.

Signs of a faulty impeller: A loud or unusual noise from the pump can indicate that the impeller is not working properly.
Fix: To fix a faulty impeller, you may need to disassemble the pump and clean or replace the impeller. This is a more advanced repair that may require professional assistance.

7. Low Water Levels

If the water level in your pool is too low, the pump may not be able to draw in enough water, which can result in low pressure.

Signs of low water levels: If the water level is below the skimmer, you may notice a significant drop in pump pressure.
Fix: Ensure the water level is at the appropriate height—about halfway up the skimmer opening. Add water as needed to keep the level consistent.

How to Maintain Proper Pool Pump Pressure

To avoid recurring issues with low pump pressure, it’s essential to maintain your pool pump system regularly. Here are some steps you can take to ensure proper pressure and efficient performance:

Regular cleaning: Clean the filter, skimmer baskets, and pump baskets regularly to prevent debris buildup that can cause clogs and reduced pressure.
Check for leaks: Periodically inspect the pump system for air or water leaks. Fix any issues immediately to maintain proper pressure.
Monitor pressure: Use the pressure gauge on your pool pump to monitor pressure regularly. This can help you identify any issues before they become significant problems.
Backwash the filter: For sand filters, backwashing is an essential step in maintaining proper pressure. Be sure to backwash as needed to prevent debris buildup.
Maintain water levels: Keep your pool’s water level at the appropriate height to ensure proper water flow into the pump.

When to Call a Professional

While many pool pump issues can be resolved by the pool owner, some problems may require professional assistance. If you’ve tried the steps above and your pump is still losing pressure, it may be time to call a professional.

Pump repairs: If the pump impeller or motor is faulty, you may need a professional to repair or replace it.
Electrical issues: If the pump is not turning on or there are electrical issues, a certified technician can diagnose and fix the problem.
Clogged pipes or deep blockages: If the issue is a deeper blockage in the pipes that you can’t reach, a professional may need to inspect and clear the lines.

Additional Tips for Preventing Pressure Loss

Here are some extra steps you can take to prevent your pool pump from losing pressure in the future:

Install a variable-speed pump: Variable-speed pumps are more energy-efficient and tend to have fewer pressure issues compared to single-speed pumps.
Use a larger pump for bigger pools: If you have a larger pool, consider upgrading to a pump with higher flow capacity to maintain optimal pressure.
Perform regular system checks: Check the pool pump, filter, and plumbing regularly to ensure everything is functioning properly.