how much sand for a hayward pool filter


Author: Poolking - Swimming Pool Equipment Manufacturer

The Complete Guide to Determining the Right Amount of Sand for Your Hayward Pool Filter

Whether you are a pool owner, installer or maintainer, one of the crucial components of your pool system is the filter. The Hayward pool filter is a popular choice for many people due to its effectiveness and efficiency. However, like any other filtration system, the Hayward pool filter requires proper maintenance, which includes ensuring that it has the right amount of sand.

Sand is the medium that filters the water as it passes through the Hayward filter, trapping impurities and dirt particles. The question that many people ask is, how much sand do I need for my Hayward pool filter? In this guide, we'll look at the factors that determine the amount of sand you need for your Hayward pool filter, and how to ensure that you have the right amount.

Factors that Determine the Amount of Sand Required for Hayward Pool Filter

1. Filter Size

The size of your filter is the first consideration when determining how much sand you need. Hayward filters come in various sizes, ranging from 16 inches to 36 inches. The larger the filter size, the more sand it requires. For instance, a 16-inch Hayward pool filter requires 50 pounds of sand, while a 36-inch filter requires up to 350 pounds of sand.

2. Pressure Rating

The pressure rating of your Hayward filter is another crucial consideration when determining the amount of sand you need. The pressure rating ranges from 30 to 50 PSI, and the size of the filter tank determines the pressure rating. The higher the pressure rating, the more sand you need. For instance, a 30 PSI filter requires 1 pound of sand per square foot of filter area, while a 50 PSI filter requires up to 2 pounds of sand.

3. Sand Type

The type of sand you use in your Hayward filter also affects the amount you need. There are various types of filter sand available, such as ordinary silica sand, zeolite sand, and glass sand. Each type has a different weight per volume, which affects how much sand you need. For instance, zeolite sand is lighter than ordinary silica sand and requires less sand for the same filter size.

4. Water Quality

The quality of the pool water also affects the amount of sand you need for your Hayward filter. If your water has high levels of contaminants, such as algae, leaves, and debris, you may need more sand. This is because the filter sand will clog up quickly, reducing its effectiveness in trapping impurities.

5. Frequency of Backwashing

Lastly, the frequency of backwashing your Hayward filter also affects the amount of sand you need. Backwashing is the process of cleaning the filter by reversing the flow of water through it. It removes accumulated debris and refreshes the sand, making it effective in trapping impurities again. The more you backwash your Hayward filter, the more sand you need, as it reduces the sand bed depth with each backwash.

How to Determine the Right Amount of Sand for Your Hayward Pool Filter

Now that you know the factors that affect the amount of sand you need, it's time to determine the right amount for your Hayward pool filter. Here's how:

1. Check your Hayward filter size and pressure rating from the manual or label on the filter tank.

2. Determine the sand bed depth required from the manual or label. It should be 2-3 inches for most Hayward filters.

3. Calculate the filter area by multiplying the filter diameter by itself and then by 0.7854. E.g., for a 24-inch-diameter filter, the filter area is 452.39 square inches.

4. Calculate the amount of sand required by multiplying the sand bed depth, the filter area, and the weight of sand per volume. E.g., for a 24-inch filter with a 2-inch sand bed depth, a filter area of 452.39 square inches, and a sand weight of 1 pound per square foot, you need 6.81 pounds of sand (2 x 452.39 x 1/144).

5. Adjust the amount of sand required based on the sand type, water quality, and frequency of backwashing, if necessary.


In conclusion, determining the right amount of sand for your Hayward pool filter is a vital step in maintaining clean and clear pool water. Ensure that you follow the above steps and factor in the various considerations to get the right amount of sand for your filter size, pressure rating, and water quality. With the right amount of sand, you'll enjoy maximum filtration efficiency, a reduction in maintenance costs, and prolonged equipment life.


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