when do you backwash a pool filter

Author: Poolking - Swimming Pool Equipment Manufacturer

When Do You Backwash a Pool Filter?

Maintaining a sparkling clean pool is a top priority for any pool owner. One essential part of pool maintenance is the regular cleaning of the pool's filter system. Without proper cleaning, the pool filter will become clogged with debris and will not effectively remove contaminants from the water. Backwashing your pool filter is a critical step in keeping your pool clean and swimmable.

What is Backwashing?

Backwashing is the process of reversing the flow of water through a pool filter to flush out the debris that has accumulated on the filter media. The pressure of the water forces the debris out of the filter and into the waste line or drain. Backwashing is necessary because as the filter traps debris, it becomes less efficient at removing all the contaminants from the water, and backwashing helps to restore the filter's effectiveness.

Types of Pool Filters

There are three types of pool filters: sand, cartridge, and diatomaceous earth (DE) filters. Each type of filter has its unique cleaning requirements, and it is essential to understand the specific cleaning needs of your pool filter.

Sand Filters

Sand filters use sand to trap debris from the water as it passes through the pool filter. Over time, the sand will become clogged with debris, and backwashing is necessary to flush out the debris.

Cartridge Filters

Cartridge filters use paper or polyester cartridges to trap debris. The cartridges are cleaned by removing them from the filter housing and hosing them down with a high-pressure water stream. Backwashing is not necessary for cartridge filters.

Diatomaceous Earth (DE) Filters

DE filters use a fine, powdered material called diatomaceous earth to trap debris. As the filter becomes clogged, the DE powder must be replaced. Backwashing is necessary to flush out the old DE powder and replace it with fresh powder.

When to Backwash

Knowing when to backwash your pool filter is crucial. Over-backwashing can waste water, while under-backwashing can lead to a dirty pool. Here are a few signs that it's time to backwash your pool filter:

- Increased pressure gauge reading: As the filter traps debris, the pressure inside the filter vessel will increase, and the pressure gauge will read higher. When the pressure gauge reads 8-10 psi higher than the clean pressure reading, it's time to backwash.

- Decreased water flow: When the water flow from your pool's return jets becomes weaker, it's a sign that the pool filter is clogged and needs to be backwashed.

- Cloudy water: If your pool water has a cloudy or hazy appearance, it's likely that the pool filter is not effectively removing all the contaminants from the water. Backwashing can help to restore the filter's effectiveness and clarify the water.

- Visible debris on the filter media: If you can see debris on the filter media, it's time to backwash. Over time, the filter will become clogged with debris, and backwashing will be necessary to remove it.

Conclusion

Backwashing your pool filter is an essential part of pool maintenance. Knowing when to backwash can help to keep your pool clean and swimmable. By understanding the specific cleaning requirements of your pool filter, you can ensure that it is functioning at maximum efficiency and effectively removing contaminants from the water. With proper maintenance, your pool will be a refreshing oasis all summer long.