Why Is My Pool Filter Pressure High?

High pressure usually indicates a clogged filter. Clean or backwash the filter to restore proper water flow.

What Causes High Pool Filter Pressure?

Several factors can cause your pool filter pressure to rise. Some of the most common include:

• Clogged Filter Media: Dirt, debris, and oils can build up in the filter over time.

• Blocked Return Lines: Obstructions in the return lines can restrict water flow.

• Dirty Pool Surface Skimmer or Pump Basket: These baskets prevent large debris from reaching your filter, but if they get clogged, pressure may spike.

• Calcium Buildup or Scaling: Over time, calcium deposits can restrict water flow.

• Incorrect Valve Position: Misaligned valves can block proper circulation.

• Algae Growth: Algae can clog your filter and raise pressure levels.

How to Identify the Cause of High Pressure

1. Check Your Pressure Gauge: Note the current reading and compare it to your filter's normal range.

2. Inspect the Pool Skimmer and Pump Basket: Remove debris that may be clogging these areas.

3. Backwash or Clean the Filter: A dirty filter is a common culprit for high pressure.

4. Examine the Return Jets: Weak water flow could indicate a blockage in the return lines.

5. Look for Algae Growth: Algae buildup can restrict water flow and increase pressure.

Step 1: Clean Your Filter

• Sand Filters: Backwash the filter for several minutes until the water runs clear.

• Cartridge Filters: Remove the cartridge and rinse it thoroughly with a hose.

• DE Filters: Backwash and recharge the filter with fresh diatomaceous earth.

Step 2: Clear Blockages in Return Lines

• Turn off the pump and open the return line valves.

• Use a plumbing snake or hose to flush out debris.

• Inspect each return jet for signs of blockage or reduced flow.

Step 3: Inspect the Pump Basket and Skimmer

• Turn off the pool pump.

• Remove the skimmer lid and clean out any trapped debris.

• Check the pump basket for leaves, hair, or other blockages.

Step 4: Address Algae Growth

• Brush your pool's walls and floor to remove algae buildup.

• Shock your pool with a strong chlorine treatment.

• Run your pool pump continuously for 24 hours to circulate the treatment.

Step 5: Monitor Pressure After Cleaning

• Once your system is clean, check the pressure gauge.

• Record the new reading to establish a baseline for your pool’s normal operating pressure.

Preventing High Pool Filter Pressure

To keep your filter pressure within the normal range:

• Clean the Filter Regularly: Establish a cleaning schedule based on your pool's usage.

• Maintain Proper Water Chemistry: Balanced pH and chlorine levels help prevent buildup.

• Vacuum the Pool Weekly: Removing dirt and debris prevents clogs.

• Check Your Filter’s PSI Gauge Weekly: Early detection can prevent bigger issues.

• Use Enzyme Cleaners: These products help break down oils and organic matter that clog filters.

When to Replace Your Pool Filter

If you've tried cleaning your filter and pressure still remains high, it may be time for a replacement. Signs your filter may need replacing include:

• Torn or Cracked Filter Elements: Cartridge filters may show visible damage.

• Consistently High Pressure Readings: Even after cleaning, pressure remains above the recommended range.

• Reduced Water Flow: Weak jets or poor circulation may signal a worn-out filter.

Understanding Normal PSI Levels

Most pool filters operate best with pressure levels between 10-20 PSI. If your pressure gauge consistently reads higher than this range, it's time to inspect your system. Keeping track of your normal PSI can help you spot pressure spikes early.

Common Mistakes to Avoid

• Ignoring High Pressure Readings: This can cause long-term damage to your pool system.

• Skipping Routine Maintenance: Regular cleaning is essential for consistent performance.

• Delaying Filter Replacement: Old filters lose efficiency and may cause pressure issues.

Final Notes

High pool filter pressure is a warning sign that shouldn't be ignored. By understanding the causes and taking proactive steps, you can maintain balanced pressure levels and ensure your pool operates efficiently. Regular cleaning, checking pressure gauges, and addressing blockages promptly will keep your pool filter in top condition.