how to backwash a de filter hayward

Daniel Parker

3 min read

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16-01-2025

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Maintaining a clean swimming pool is essential for both hygiene and enjoyment. A crucial part of pool maintenance involves regularly backwashing your filter, especially if you have a Hayward DE filter. This article provides a comprehensive, step-by-step guide on how to backwash your Hayward DE filter effectively, ensuring your pool water stays sparkling clean. Knowing how to properly backwash your Hayward DE filter is key to prolonging its lifespan and maintaining optimal pool clarity.

Understanding Hayward DE Filters

Hayward DE (diatomaceous earth) filters are known for their exceptional ability to remove fine particles from pool water, resulting in crystal-clear water. Unlike sand filters, DE filters use a fine powder called diatomaceous earth (DE) as their filtering medium. This powder coats the filter grids, creating a very fine filter cake that traps even the smallest contaminants. However, this fine filtration means the filter needs regular backwashing to prevent clogging.

When to Backwash Your Hayward DE Filter

You should backwash your Hayward DE filter when the pressure gauge indicates a pressure increase of 7-8 PSI above the clean pressure. This pressure rise signifies that the filter is becoming clogged and needs cleaning. Other signs include:

• Reduced water flow: Noticeably slower water circulation in your pool.
• Cloudy pool water: Despite regular cleaning, your pool water remains cloudy or hazy.
• Increased filter running time: Your pump is running for longer periods than usual to maintain adequate filtration.

How to Backwash a Hayward DE Filter: A Step-by-Step Guide

Tools and Materials:

• Fresh diatomaceous earth (DE) powder
• A garden hose or bucket for adding DE
• Pool filter cleaning brush (optional, but highly recommended)

Step 1: Turn Off the Pump

Before you begin, always turn off the pump and ensure it's completely powered down. Safety first!

Step 2: Select the "Backwash" Position

Locate the multiport valve on your filter. Rotate the handle to the "Backwash" setting. The exact position might vary slightly depending on your specific Hayward model, so consult your filter's manual if needed.

Step 3: Turn on the Pump

Turn the pump back on. You should see water flowing out of the waste port, ideally carrying away the accumulated dirt and debris. Let the water flow for approximately 2-3 minutes. This thoroughly cleanses the filter grids.

Step 4: Turn Off the Pump & Switch to "Rinse"

Turn the pump off and switch the multiport valve to the "Rinse" position. This crucial step removes any remaining DE from the filter and prepares it for refilling. Turn the pump back on for about one minute.

Step 5: Switch to "Filter" Position & Add DE

Turn the pump off again. Switch the multiport valve to the "Filter" position. Now it's time to add fresh DE. You'll need to consult your Hayward filter manual to determine the correct amount of DE to add. Typically you'll add the DE through the skimmer or a dedicated DE port.

Step 6: Turn on the Pump & Monitor Pressure

Turn the pump back on. Monitor the pressure gauge. The pressure should stabilize to its usual clean pressure within a short period. If the pressure doesn’t drop significantly, repeat the backwashing process.

Step 7: Regular Cleaning and Maintenance

Regular backwashing is crucial for efficient filter operation. How often you need to backwash depends on factors like pool usage and weather conditions. Aim for backwashing every 2-3 weeks, or more often if the pressure gauge indicates the need. Additionally, consider a periodic inspection and cleaning of your filter grid elements for optimal performance.

Troubleshooting Common Issues

• High pressure even after backwashing: This could indicate a problem with the filter grids. Inspect for damage or clogging. Consider replacing the grids if necessary.
• Cloudy water after backwashing: You might not have added enough DE or the DE you're using is of poor quality. Check the instructions for your filter model.
• Leaking filter: This requires immediate attention. Check all connections and O-rings for any signs of wear or damage. Replace damaged parts as necessary.

Regular backwashing, along with proper maintenance, ensures the longevity and optimal performance of your Hayward DE filter. By following this step-by-step guide, you can keep your pool water crystal clear and enjoy a refreshing swim. Remember to always consult your filter's manual for specific instructions tailored to your model.