how much sand do you put in pool filter


Author: Poolking - Swimming Pool Equipment Manufacturer

If you own a swimming pool, you know the importance of proper maintenance. One of the most critical parts of keeping your pool clear and sparkling is the filtration system. Your pool filter is responsible for removing debris, bacteria, and other contaminants from the water. But to do its job effectively, it needs to be filled with the right amount of sand.

So, how much sand do you put in a pool filter? In this article, we will discuss everything you need to know about sand filters and their capacity requirements.

What is a pool filter?

A pool filter is a crucial part of your pool's circulation system. The filter removes debris, dirt, and algae from the water. The water flows through the filter and gets rid of the contaminants, and eventually returns to your pool as clear and clean water.

There are three types of pool filters: Sand filters, cartridge filters, and diatomaceous earth (DE) filters. Sand filters are the most commonly used type of pool filter. They are affordable, and their maintenance is relatively easy.

How much sand does a pool filter need?

Sand filters use a bed of specially graded sand to trap particles and contaminants that flow through the pool filtration system. The amount of sand needed for your pool filter depends on the size of your pool filter.

The general rule is that the sand filter should be filled with sand about two-thirds of the way up the tank. The level of sand in your pool filter should be halfway between the top of the filter and the bottom of the lateral assembly.

To calculate the amount of sand required for your pool filter, you need to know the size of the filter and the type of sand to use. For instance, a 24-inch pool filter requires approximately 150 pounds of sand. On the other hand, a 30-inch pool filter requires roughly 250 pounds of sand.

What type of sand should you use in a pool filter?

When filling your pool filter, it's essential to use the right type of sand. The sand used in a pool filter is not the same as the sand you find on the beach. The sand used in pool filters is specially graded and is referred to as #20 silica sand.

The #20 silica sand is perfect for pool filters as it's angular and has sharp edges, making it able to trap contaminants effectively. Additionally, the sand is chemically inert, meaning it does not react with the chemicals in your pool.

When purchasing sand for your pool filter, check that it's labeled as #20 silica sand. The sand should also be free of impurities and debris.

How often should you replace sand in a pool filter?

Sand filters are durable and can last up to ten years before requiring replacement. However, the filter requires routine maintenance, which includes regular cleaning or backwashing to remove contaminants trapped in the sand.

Over time the sand bed can become compacted, reducing the filter's effectiveness in removing contaminants. When you notice your pool water appearing cloudy, it's a sign that your sand filter needs maintenance.

The sand in your pool filter requires replacement every five to seven years, depending on the filter's usage and other factors.

5 Steps to filling your pool filter with sand:

To fill your pool filter with sand, follow these steps:

1. Turn off the system: Before performing any maintenance, ensure the pool's circulation system is off.

2. Open the filter valve: Once the system is shut off, open the filter valve.

3. Remove existing sand: With the filter valve open, remove the existing sand in the filter tank.

4. Fill with new sand: Using a funnel, slowly pour new sand into the filter tank.

5. Close the valve: When you've added the required amount of sand, close the filter valve.


Maintaining your pool's filtration system is crucial to keep it in good working condition. Knowing how much sand to put in your pool filter is imperative in its proper maintenance. Remember to use the recommended sand type for your filter and replace your sand every five to seven years.

By adhering to these guidelines, you can be sure that your pool filtration system is functioning correctly and providing you with sparkling, clean water to swim in.


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