Fiberglass pools provide years of memories for pool owners. The crystal-clear water brings joy and relaxation. However, keeping your water clear involves more than just routine cleaning and chemical adjustments. According to independent pool dealers in our network, backwashing the sand filter is an often overlooked yet crucial pool maintenance step for those with this type of filtration system. Let’s explore the importance of backwashing, some frequently asked questions, and how it’s done.
There are three available types of pool filters: sand, diatomaceous earth (DE), and cartridge. Sand filters are a very common form of swimming pool filtration, and they are particularly good at catching microscopic particles like algae and phosphates. Sand filters require very little maintenance, but the sand may need replacing every two to four years or so.
Backwashing a sand filter is a maintenance procedure that cleans the filter and ensures it operates efficiently. Over time, as water pumps through the sand filter, debris and particles are trapped by the sand, removing them from the pool water. This process gradually accumulates dirt and debris in the filter, which can decrease efficiency and lead to cloudy pool water.
Backwashing reverses the water flow through the sand filter. Instead of dirty water coming in and clean water going out, clean water is pumped backward through the filter. This reverse flow lifts and flushes the trapped debris from the sand bed and the filter through a waste line or drain.
During backwashing, the sand within the filter loosens, allowing the trapped debris to be expelled. After backwashing, the filter is returned to its normal operation mode and ready to filter pool water again. This process is essential for maintaining the filter’s ability to clean the pool water effectively and should be performed regularly as part of the pool’s maintenance routine.
Backwashing keeps your filter functioning properly and clear of debris. It also helps to keep your water clear. You can religiously add chlorine to the chlorinator, check its settings, sweep down the pool walls, empty skimmer baskets, vacuum dirt and debris from main drains, do water tests, maintain the correct water level, and clean the steps going into the pool. Regardless, your pool water will get cloudy if you forget to clean the filter. Nobody wants that.
If you don’t backwash your sand filter, you may notice your water getting cloudy or debris making its way to the surface of your pool water. As stated above, you can do all other essential maintenance tasks, but none will replace the need for backwashing.
You will need to check your filter’s pressure gauge. When clean, your filter will have a typical reading you should note. You’ll know it’s time to backwash once the gauge reaches 8 to 10 pounds (psi) above your baseline reading. Your water may also look cloudy or dirty when the filter is ready to be backwashed.
As with all aspects of your pool’s operation and maintenance, please follow the sand filter’s instructions carefully, as each model varies slightly. You will likely find directions on the filter itself. Your filter and your pump are the backbones of your pool, and it’s essential to pay equal attention to both of them. A failure of either will cause problems and cost you money. You should consult a pool professional if you have any pool maintenance concerns.