Cleaning a Diatomaceous Earth (DE) grid pool filter is a vital maintenance task for any pool owner who wants to keep their pool water crystal clear and the filtration system running efficiently. DE filters are popular because they offer superior filtration compared to sand, as they can capture smaller particles and debris. However, over time, the DE coating on the filter grids gets dirty and often full of oils from sun tan lotions, body oils and other chemicals. Dirty DE grids leads to filter performance declining. Regular cleaning helps maintain the filtration efficiency, extends the life of the filter, and prevents clogs and poor water circulation.

1. Understanding DE Filters

Diatomaceous Earth filters use a fine powder made from the fossilized remains of diatoms (microscopic algae). When DE is added to the filter, it coats a series of grids inside the filter tank, creating a fine mesh that traps debris as the pool water passes through. Because diatoms are so small, they create an incredibly effective barrier to filter out debris.

Over time, as the filter traps dirt and particles, the DE coating on the grids becomes dirty and less effective. This reduces the filter's ability to clean the water and can lead to an increase in pressure within the system. To restore its effectiveness, the DE filter grids need to be cleaned regularly.

2. How Often Should You Clean a DE Pool Filter?

How often you clean your DE filter depends on several factors, including how often you use the pool, the type of debris that accumulates, and the condition of the filter. As a general guideline:

• Clean every 6-12 months: If you use your pool frequently or experience heavy debris accumulation, cleaning every 6 months is recommended.
• After heavy storms or debris accumulation: If the pool filter pressure increases or the filter becomes clogged with debris, it may need cleaning sooner.
• When the filter pressure rises 8-10 psi above the normal reading: This indicates that the filter is becoming clogged and needs to be cleaned.
• If the filter is oily: If you and other pool users use lots of sun tan lotions, sunscreen, body lotions and other oils that can cause a greasy buildup in your DE grids.

3. What You’ll Need

Before beginning the cleaning process, gather the necessary tools and materials. Here's a list of what you’ll need:

• Protective gloves and goggles
• Pool filter cleaner or muriatic acid (for deep cleaning)
• Garden hose with a spray nozzle
• Soft brush (non-abrasive)
• Bucket for soaking grids
• Towel or cloth
• Replacement DE powder (optional, but recommended)

4. Step-by-Step Guide to Cleaning a DE Pool Filter

Step 1: Turn Off the Pool Pump

Before you begin the cleaning process, always turn off the pool pump and shut off the power to the pool’s filtration system. This will ensure your safety while working on the system and prevent any accidents.

Step 2: Relieve Pressure from the Filter

Next, you’ll need to relieve the pressure in the filter. Locate the pressure relief valve (usually found on the top of the filter tank) and open it to release any pressure. This step is important to avoid accidents when you open the filter.

Step 3: Remove the Filter’s Access Panel

Depending on your DE filter model, you may need to remove the filter’s access panel. The panel is typically secured with screws or latches. Remove the screws or latches to open the filter housing. This will expose the internal grids, allowing you to clean them.

Step 4: Remove the DE Grids

Once the access panel is removed, carefully pull out the DE filter grids. The grids are usually arranged in a vertical configuration and should be gently pulled out of the filter housing. Be careful not to damage the grids while removing them. If the grids are difficult to remove, consult the manufacturer's manual for guidance on how to release them safely.

Step 5: Rinse the Grids

Once the grids are removed, rinse them thoroughly with a garden hose to remove any loose dirt and debris. Use a spray nozzle to rinse the grids gently but thoroughly. This will help remove the majority of the particles that have been trapped in the DE filter.

Step 6: Clean the Grids with a Brush

If the grids are still dirty after rinsing, use a soft brush (like a nylon brush) to scrub away stubborn dirt and debris. Start at the top of the grids and work your way down to avoid pushing dirt deeper into the grid structure. Be careful not to use anything too abrasive, as it could damage the grids or the DE coating.

Step 7: Soak the Grids (Optional)

For heavy buildup of oils, minerals, or other stubborn debris, soak the grids in a cleaning solution. You can use a pool filter cleaner or a diluted solution of muriatic acid and water (typically a 10:1 ratio). Soak the grids for 30 minutes to an hour, depending on how dirty they are. This will help break down any oils or mineral deposits that are resistant to normal rinsing.

After soaking, remove the grids from the cleaning solution and rinse them thoroughly with fresh water. If you used muriatic acid, make sure to rinse the grids well to remove any chemical residue.

Step 8: Inspect the Grids

After cleaning, inspect the grids for any signs of wear, such as cracks, tears, or damage to the fabric. If you notice any issues, it may be time to replace the grid. A damaged grid will reduce the efficiency of the filter and may cause debris to bypass the filtration system.

Step 9: Reassemble the Filter

Once the grids are thoroughly cleaned and dried, it’s time to reassemble the filter. Carefully place the grids back into their original position inside the filter tank. Make sure the grids are securely seated and properly aligned before closing the access panel.

Step 10: Add New DE Powder

After reassembling the filter, it’s time to add fresh Diatomaceous Earth (DE) powder. The amount of DE you need will depend on the size and model of your filter. Check the manufacturer’s manual for the exact amount. Typically, DE powder is added through the skimmer while the pump is running.

To add the DE powder:

1. Turn the pool pump back on.
2. Pour the required amount of DE powder into the skimmer while the pump is running. This allows the DE to coat the filter grids.
3. Watch the pressure gauge as the DE powder settles onto the grids. The pressure should gradually return to normal.

Step 11: Check for Leaks and Pressure

After you’ve added the DE powder and the filter is running again, check for any leaks around the filter housing. Also, monitor the pressure gauge on the filter. If the pressure is still too high or fluctuating significantly, it may indicate a problem with the filter assembly or a need for further cleaning.

5. Additional Tips and Considerations

• Avoid Overusing DE Powder: When recharging the filter with DE, be careful not to use too much powder. Too much DE can cause the filter to become overworked and reduce its efficiency.
• Regular Backwashing: To extend the time between DE grid cleanings, backwash the filter regularly (every 4-6 weeks or as needed) to remove excess dirt and debris. This helps reduce buildup on the grids.
• Deep Cleaning Annually: Even with regular backwashing, it's still important to deep clean the grids every 6-12 months, especially if you notice any loss of pressure or a decline in filtration performance. Use an acid wash or degreasing agent as part of your deep cleaning process.
• DE Grids Can Break: Old DE grids, especially in systems that aren't cleaned as regularly can chip, crack or outright break. If that happens you can replace the entire set or order individual grids as replacements. Hurricane Filters offers both options for 24, 36, 48, 60 and 72 inch DE grids.

Cleaning your DE pool filter is an essential part of pool maintenance. By following the proper steps and performing regular cleanings, you ensure your pool filtration system operates efficiently, your pool water stays clean and clear, and the lifespan of your DE filter is extended. Although the cleaning process may seem time-consuming, the benefits of maintaining a properly functioning DE filter far outweigh the effort required.