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when do i backwash my pool filter

Author: Poolking - Swimming Pool Equipment Manufacturer

Introduction

Having a swimming pool in your backyard is a great way to enjoy time with family and friends. However, owning a pool comes with a certain amount of maintenance to ensure the water stays clean and clear. One essential component of maintaining your pool is knowing when to backwash your pool filter. In this article, we will discuss how often you should backwash your pool filter and why it is important.

What is backwashing?

Before discussing when to backwash your pool filter, it's important to know what backwashing means. Backwashing is a process that cleans the pool filter by reversing the flow of water through the filter. This process dislodges any dirt or debris that has accumulated in the filter and flushes it out through the waste line.

When do you need to backwash your pool filter?

The frequency of backwashing your pool filter depends on many factors, such as the size of the pool, usage, and the type of filter installed. However, most pool experts suggest backwashing a sand filter every two weeks, while a cartridge filter may require backwashing less frequently.

Subheading: Check the pressure gauge

One of the easiest ways to determine when to backwash your pool filter is by checking the pressure gauge. As water flows through your pool filter, the filter collects dirt and debris, which causes the pressure in the filter to rise. As the pressure increases, it becomes more difficult for water to pass through the filter, and your pool equipment has to work harder, resulting in increased energy consumption. To avoid this extra energy expense, it's important to check the pressure gauge on your pool filter regularly. When the pressure reaches 8-10 psi above the normal operating pressure, it's time to backwash the filter.

Subheading: Watch for diminished water flow

Another sign that it's time to backwash your pool filter is when you notice diminished water flow. If you start to see that water is not flowing through the return jets as strongly as before or if you notice that your pool vacuum has become less effective, it is probably because your filter is clogged with debris. Backwashing the filter will help to remove the debris and restore normal water flow.

Subheading: Consider pool usage

The frequency of backwashing your pool filter may also depend on how often you use your pool. If you use your pool frequently, you might want to backwash the filter more often. This is because more usage leads to more debris buildup in the pool filter.

Subheading: Time of year

The time of year can also influence how often you need to backwash your pool filter. For example, if your pool is located under trees or if it's surrounded by plants or flowers, you might have to backwash the filter more often during the fall and spring season when leaves and flowers are falling. Similarly, if there is construction work going on nearby, then you might have to backwash more often to remove construction debris from the pool.

Subheading: Type of filter

The type of filter installed can also determine how often backwashing is required. A sand filter usually needs to be backwashed every two weeks, while a cartridge filter may last up to a month or more before backwashing is required. A DE filter requires backwashing less often but demands a more extensive cleaning.

Conclusion

A clear swimming pool is a refreshing and inviting place to be, but it requires regular maintenance to keep it that way. Knowing when to backwash your pool filter is a crucial part of pool maintenance. As discussed above, the frequency of how often you need to backwash your pool filter depends on numerous factors, such as usage, pool size, the type of filter, and the time of year. It is essential to pay attention to these factors to ensure that your swimming pool stays clear and sparkling clean.

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----It is best to replace the silica sand of sand filters every 1-2 years for the following reasons:
a During backwashing, the filtration bed volume will expand upwards by 1.2 to 1.3 times. The water flow will drive the filtration layer to flow up and down, causing the filtration material particles to collide with each other. Backwash will let the small sand evacuate.
b.Some silica sands will be welded when the acid and alkali are changed due to insufficient purity;
Therefore, the longer the time, the worse the filtering effect of the sand tank. Since backwashing will consume and take away some sand, we need to replace the sand in the sand tank within the specified period.
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After about 5~10days ,or when the reading of the pressure gauge on the pump side of the filter has increased by about 0.2bars since the last backwash , backwash the filter as follows:
1. Stop the pump
2.Close the valves on the suction and return lines.
3.Open the cover of the pump and empty the filter gasket .
4.Refit the cover
5.Open the valve to the drain outlet
6.Turn the lever to BACKWASH
7. Open the valves to the suction and return lines.
8.Start the pump .Rinse the filter for about 1 to 2 minutes until the water in the sight glass is clear .
NOTE : Any electric heater must be off .
9. Stop the pump
10. Turn the lever to RINSE , start the pump and rinse for about 15~30 seconds. Stop the pump and turn the lever to FILTER . This is the normal operating position .
11. Close the drain outlet valve and start the pump . Switch on the electric heater if any .
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Contact: Sandy

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