How to Backflush a De Pool Filter

How to Backflush a DE Pool Filter: Ultimate Guide

How to Backflush a DE Pool Filter

Welcome to our guide on backflushing a DE (Diatomaceous Earth) pool filter. Proper maintenance of your pool filter is essential to keep your pool water clean and clear. Backflushing is a crucial part of this maintenance routine, as it helps remove built-up debris and dirt from the filter, ensuring optimal performance. In this article, we will walk you through the step-by-step process of backflushing a DE pool filter.

How to Backflush a DE Pool Filter: Ultimate Guide


How to Backflush a DE Pool Filter: Ultimate Guide


What is a DE Pool Filter?

A DE pool filter is a type of filter commonly used in swimming pools to keep the water clean and free of impurities. It uses diatomaceous earth, a natural substance, to filter out even the smallest particles from the water, providing superior filtration compared to other types of filters.

When to Backflush a DE Pool Filter?

It is recommended to backflush a DE pool filter when the filter’s pressure gauge rises 8-10 psi above the normal operating pressure. This increase in pressure indicates that the filter is clogged with debris and needs to be cleaned to maintain efficient filtration.

Step-by-Step Guide to Backflushing a DE Pool Filter

  1. Turn off the pool pump: Before starting the backflushing process, make sure to turn off the pool pump to prevent any damage to the system.
  2. Locate the backwash valve: Find the backwash valve on your DE pool filter system. This valve is used to redirect the flow of water during the backflushing process.
  3. Connect the backwash hose: Attach the backwash hose to the waste port on the backwash valve. Make sure the hose is securely attached to prevent any leaks.
  4. Set the valve to backwash mode: Turn the backwash valve to the “backwash” position to redirect the water flow for cleaning the filter.
  5. Turn on the pump: Start the pool pump to initiate the backflushing process. The dirty water will be discharged through the backwash hose.
  6. Monitor the process: Keep an eye on the water flowing through the backwash hose. Once the water runs clear, the backflushing process is complete.
  7. Turn off the pump: Once the water is clear, turn off the pool pump to stop the backflushing process.
  8. Rinse the filter: After backflushing, it is recommended to rinse the DE filter with clean water to remove any remaining debris and diatomaceous earth particles.
  9. Set the valve to filter mode: Finally, turn the backwash valve back to the “filter” position to resume normal filtration operation.

Tips for Effective Backflushing

  • Regular backflushing helps maintain the efficiency of your DE pool filter and prolong its lifespan.
  • Monitor the pressure gauge regularly to determine when backflushing is required.
  • Backflushing should be done at least once a month, or more frequently based on pool usage and environmental factors.
  • Always follow the manufacturer’s instructions when backflushing your DE pool filter.
  • Consider adding a filter cleaner or degreaser to enhance the backflushing process and remove stubborn debris.


Backflushing your DE pool filter is a simple yet essential maintenance task that helps ensure your pool water remains clean and crystal clear. By following the step-by-step guide outlined in this article and implementing the tips for effective backflushing, you can keep your DE pool filter in optimal condition and enjoy a sparkling pool all season long.

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