Pool Filter Maintenance 101

A well-maintained filter keeps your pool clean, healthy, and efficient. Whether you’re just starting out or fine-tuning your pool care routine, this filter maintenance guide walks you through all stages—filter types, maintenance schedules, seasonal strategy, and troubleshooting.

Which Filter Do You Have?

Understanding your filter type ensures you’re using the right care approach:

Sand Filters: Water is filtered through sand grains and sent back into the pool.
Pro tip: Backwash when the pressure gauge rises 8–10 psi above normal to clear trapped debris.

Cartridge Filters: Uses a pleated filter cartridge to trap dirt.
Pro tip: Rinse every 2–4 weeks and replace intervals depend on filter size and pool usage.

Diatomaceous Earth (D.E.) Filters: Provides the finest filtration using DE powder coated on grids.
Pro tip: Backwash when pressure increases 8–10 psi above baseline, then replenish with fresh D.E. powder.

Why Filter Care Matters

Neglect leads to:

Poor water clarity

Strain on the pump

Potential contamination

Costly repairs or early replacement

Proper upkeep prolongs the life of your system—and keeps your water sparkling.

Routine Maintenance Steps

Weekly:

Check Pressure Gauge: When it reads 8–10 psi above clean baseline, it’s time to clean the filter.

Remove Debris: Clear leaves and large debris around the filter to maintain airflow.

Inspect O-Rings & Seals: Lubricate them to prevent leaks and maintain pressure integrity.

Monthly:

Sand Filters: Inspect sand depth, and top up if it's dipped below halfway in the tank.

Cartridge Filters: Thoroughly rinse with a high-pressure hose.

DE Filters: Check the grids in the tank and make sure DE is evenly coating them.

Seasonal Pool Filter Maintenance Guide

Filters need distinct care across the seasons—here’s a breakdown:

Spring: Disassemble the filter completely, clean all parts, check seals, and recoat DE filters.

Summer: Expect more frequent cleanings thanks to usage and allergens—keep an eye on pressure and clear debris often.

Fall: With leaves falling, boost maintenance and schedule a deep clean pre-winter.

Winter: In cooler zones, winterize your filter by releasing pressure, draining it, and protecting it from cold damage.

Troubleshooting Common Issues

Keep this quick-reference handy:

High Pressure, Poor Flow: Backwash sand/DE filters, or rinse cartridge filters thoroughly.

Leaks Around the Filter: Tighten clamps, lubricate seals, and replace worn O-rings or gaskets.

Cloudy or Unfiltered Water: Replace the cartridge, add fresh DE powder, or backwash your sand filter.

Filter Won’t Relieve Pressure: Ensure the multiport valve is correctly placed; clean or replace valve parts if malfunctioning.

Final Word

Consistent attention—weekly check-ins, seasonal deep cleans, and fast fixes—means a filter that performs reliably and keeps costs down. Plus, you get to enjoy crystal-clear water all season long!

In The Swim makes every effort to provide accurate recommendations based upon current ANSI/APSP/ICC-5 2011 (R2022) standards, but codes and regulations change, and In The Swim assumes no liability for any omissions or errors in this article or the outcome of any project. You must always exercise reasonable caution, carefully read the label on all products, follow all product directions, follow any current codes and regulations that may apply, and consult with a licensed professional if in doubt about any procedures. In The Swim assumes no legal responsibility for your reliance or interpretation of the data contained herein, and makes no representations or warranties of any kind concerning the quality, safety, or suitability of the information, whether express or implied, including, without limitation, any implied warranties of merchantability or fitness for a particular purpose.