How to Backwash a Pool DE Filter

Cleaning a DE filter is key to clear and safe pool water. Backwashing removes built-up dirt and debris—just turn off the pump, switch the valve to backwash, and run until the sight glass is clear. Then add fresh DE powder, and the filter will be good to go. This simple process maintains a good flow and keeps our pool clean and clear.

Knowing when to backwash a DE filter is crucial for maintaining a clean pool and keeping the system running smoothly. We check the pressure gauge, inspect the water, maintain a regular backwash schedule, and frequently check the pressure gauge.

Pressure Gauge Reading

The pressure gauge indicates the level of resistance the water encounters as it passes through the filter. A clean DE filter should read less than 20 psi. If the pressure is 20 psi or more above the clean reading, it means the filter is clogged and the water flow is restricted.

Visual Cues

We also look for signs in the water itself. If the pool water appears cloudy or dirty, it may indicate that the filter is not functioning properly. More debris in the water means the DE media is blocked, and backwashing is needed to remove the trapped particles.

Another sign is slow water flow from the pool jets. If the water feels weaker than usual, it may mean the filter is clogged, and we should backwash soon. The spa may not overflow to the pool as fast as usual when the filter is dirty.

Regular Schedule

Even with gauges and water checks, a regular backwash schedule helps avoid problems. Depending on how frequently we use the pool and how dirty it becomes, backwashing every 4 to 6 weeks is usually sufficient.

If we swim a lot or it rains heavily, we may need to backwash more often.

Checking The Pressure Gauge Regularly

We need to check the filter’s pressure gauge at least twice a week. This helps us catch pressure changes early. Checking after heavy pool use or storms is also a good idea, as more dirt can accumulate quickly.

Recording the pressure readings can help us identify trends and predict when backwashing is necessary. Regular checks ensure the filter works properly and prevent more significant issues with our pool’s circulation.

Safety First!

Before we work on our DE filter, we need to take some important safety steps. These help us avoid injuries and protect the equipment. Paying attention to these details makes the process smooth and safe for everyone.

Turn Off The Pump

The first step is to turn off the pool pump. This stops the water flow and reduces pressure in the filter. If the pump is on water, debris could spray out and hurt us.

We should also unplug the pump or switch off the circuit breaker for extra safety. This prevents the pump from turning on while we are working. Never start the backwash process without first turning the pump off.

Read Your Filter Manual

Every DE filter is unique and has its own components and safety guidelines. We should read the manual before we start. The manual tells us how to open the filter and handle the pressure release valves.

Ignoring the manual can lead to mistakes, such as opening the filter while it is still pressurized. This can cause parts to fly off or serious injury.

Wear Appropriate Protection

We should wear safety gear, such as gloves and eye protection. Gloves protect our hands from sharp parts and chemicals. Eye protection keeps us safe from splashes of dirty water or cleaning chemicals.

Long sleeves and closed-toe shoes are also a good idea. These limit skin exposure when handling filter elements or chemicals.

Backwashing a DE filter is a precise process to keep our pool water clear and clean. We follow specific steps to clean the filter without damaging any parts. Each step is important for maintenance.

Turn Off The Pool Pump

We always start by turning off the pool pump. This prevents water flow and pressure in the system, allowing us to adjust the valve settings safely and effectively. Never skip this step to avoid damage or injury.

Find The Multiport Valve Or Push-Pull Valve

Next, we find the pool’s multiport valve or push-pull valve. This valve controls the water flow through the filter system and lets us switch to backwash mode.

Attach and Secure The Backwash Hose

We then attach a hose to the waste port on the multiport valve. This hose directs dirty water outside the pool area. Make sure the hose is secure and leads to a drainage spot.

Position The Multiport Valve To Backwash

We turn the valve handle to the “Backwash” position. This setting reverses the water flow through the filter, flushing out trapped debris. Make sure the valve clicks into place to avoid leaks or misdirection of water.

Turn On The Pool Pump

Once the pool pump is in the backwash position, we turn it back on. This starts water flow backward through the filter, pushing dirt and debris out through the hose. We watch for steady water movement to the drain.

Backwash For The Recommended Time

We backwash for about 2 to 3 minutes or until the water outflow is clear. Check the water quality to make sure the filter is clean. Over-backwashing wastes water; under-backwashing leaves debris trapped.

Turn Off The Pool Pump Again

After backwashing, we turn off the pool pump again. This stops the water flow before we change the valve setting again, preventing damage to the filtration system.

Position The Multiport Valve To Rinse

Next, we set the valve to “Rinse.” This clears any remaining dirt in the filter in the proper flow direction. Rinsing also helps resettle the DE powder inside the filter grids.

Turn On The Pool Pump For Rinse

With the valve in rinse mode, we restart the pool pump. Water flows through the filter and out of the waste line briefly. We run this rinse for about 30 seconds to 1 minute.

Turn Off The Pool Pump Once More

We turn off the pump again to safely switch the valve back to filter mode. Each valve change is only safe when there is no active water flow.

Position The Multiport Valve To Filter

Now, we set the valve back to the “Filter” position. This resumes normal water flow through the DE filter for proper cleaning and circulation of the pool water.

Add DE Powder

We open the filter and add new DE powder according to the manufacturer’s instructions. This replenishes the filter media that traps dirt and particles in the water during the filtration process.

Turn On The Pool Pump For Filtering

We turn the pump back on with the valve in filter mode. The filter now operates with fresh DE, maintaining clear water and proper filtration.

We need to pay close attention to how water drains from the filter, how often to backwash, and what the sight glass shows. Monitoring the pressure gauge helps us know when the filter needs cleaning. Knowing how to fix common problems and when to get expert help keeps our pool safe and clean.

Drainage

Proper drainage prevents water damage and helps the backwash process work smoothly. Always open the drain valve fully before starting the backwash. This lets dirty water leave the system efficiently.

Be sure to direct the drainage hose away from the pool area, plants, or your home’s foundation. Water with filter debris can harm these areas. After backwashing, close the drain valve tightly to avoid leaks.

Frequency

How often we backwash depends on pool use and filter pressure. A good rule of thumb is to check the pressure gauge weekly. When the pressure is 8-10 psi above the normal clean reading, it’s time to backwash. If we use our pool frequently or it becomes dusty, we may need to backwash it more often. Don’t over-backwash, that wastes water and removes too much DE powder.

Sight Glass

The sight glass allows us to see the water clarity during backwash. Clear water means the filter is clean. Cloudy or dirty water indicates that more backwashing is required.

Check the sight glass every 30 seconds while backwashing. If the water remains dirty after 2-3 minutes, backwash for a longer period or check for filter issues. Clean or replace the sight glass if it becomes foggy to avoid misleading views.

Pressure Gauge Check

The pressure gauge indicates the force of water pushing through the filter. Normal pressure varies by filter but is usually marked on the gauge.

When the gauge shows a high reading (8-10 psi above normal), it’s time to backwash or do other maintenance.

Check the gauge regularly for damage or incorrect readings. Replace if faulty, so we always have accurate pressure info.

Troubleshooting Common Issues

If backwashing does not lower pressure, the DE grids might be torn or clogged. We should clean or replace these parts.

If dirty water returns to the pool, the valve may be set incorrectly or leak. Double-check the valve positions and seals.

Leaks or low water flow can happen if hoses or fittings wear out. Inspect these parts and tighten or replace as needed.

Backwashing a DE filter is a crucial step in maintaining clean and clear pool water. It clears out built-up dirt and debris, prevents damage, and improves filtration. By monitoring the pressure gauge and performing regular backwashing, we can avoid costly repairs and maintain better water quality. Simply follow these steps: turn off the pump, open the backwash valve, run until the water is clear, then restart—and your pool will be sparkling clean.

If backwashing isn’t clearing your pressure issues, you may need a deeper clean or a professional pool filter repair. We proudly serve the Round Rock, Pflugerville, and Cedar Park areas. Reach out today for expert pool services!