You should backwash a DE pool filter for 1-3 minutes.
Understanding DE Pool Filter Backwashing
Backwashing is a crucial maintenance step for diatomaceous earth (DE) pool filters. It involves reversing the water flow through the filter to remove accumulated DE powder and trapped debris. Proper backwashing ensures your filter operates efficiently and prolongs its lifespan.
Backwashing Timeframe
The recommended backwashing time is between 1 to 3 minutes. Here's a more detailed breakdown:
- Initial Backwash: When you first initiate the backwash process, you'll likely see cloudy water exiting the waste line. This is normal, and it indicates that the dirty DE powder and contaminants are being flushed out.
- Monitoring: If you have a sight glass, observe the water as it flows. Continue the backwash until the water runs clear. This usually happens within the 1-3 minute range, depending on the filter's size and the level of dirt.
- Duration: Do not backwash for longer than 3 minutes, as it may cause excessive wear on your filter components and use a lot of water.
Steps for Backwashing a DE Filter
- Turn Off the Pump: Before starting the backwash, switch off the pool pump.
- Set Valve to Backwash: Locate the multiport valve and rotate it to the "backwash" position.
- Turn the Pump On: Start the pump, initiating the reverse flow of water.
- Monitor the Water: Observe the sight glass or waste line until the water becomes clear.
- Turn Off the Pump: Once the water is clear, switch off the pump again.
- Set Valve to Rinse: Change the multiport valve position to "rinse" and turn the pump back on for about 15-20 seconds. This will settle any loose DE and prepare the filter.
- Turn Off the Pump: Switch off the pump and put the multiport valve back to its normal position.
- Recharge DE Filter: Add new DE powder into your skimmer and start the pump for normal filtering.
Practical Insights
- Frequency: The frequency of backwashing depends on pool usage, weather, and debris levels. Generally, backwash when the pressure gauge on the filter reaches 8-10 PSI over its clean operating pressure, or according to the manufacturer’s instructions.
- Sight Glass: A sight glass is a convenient feature that allows visual monitoring of the backwashing process. Without one, you might need to observe the waste line carefully.
- Too much backwash: Backwashing too much will waste water and might cause your filter to wear out faster.
- After Backwashing: Be sure to add fresh DE powder to the filter after backwashing to ensure effective filtration.
Example
For instance, if you start the backwash with murky water, and after 2 minutes the water flowing from the waste line is clear, stop the backwash. The whole process should take you under 5 minutes.
