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All commercial and residential pool owners must maintain the quality of their pools. The pool water will circulate through the filter to maintain transparency. If the pool pump is correctly working it will push water through the filter media. It is mostly made up of sand, diatomaceous earth, and a cartridge. When you have a sand filter it is necessary to find out how much sand for a 13 inch sand filter. This will help optimize the effectiveness of the sand like never before. Having too much or little sand can cause a lot of problems in the filter.

How to Calculate the Amount of Sand You Need to Add?

When you purchase a sand filter it is important to check out the specifications and instructions printed on them. You must know how much sand must be added to the pool filter. There is no doubt that replacing the sand in your swimming pool filter is not a difficult task. Most pool owners cannot determine the correct amount of sand though. If you are still not sure how to determine the correct amount of sand, here are some tips below:

sand filter

The Two-Thirds Rule

Most sand filters are designed in such a way that you can fill them about two-thirds. This helps you have some space above the sand bed too. However, it will still catch up with all the water that flows through it. You can follow this basic rule that gives an idea about how much sand for a 13 inch sand filter requires.

The first thing is to measure the diameter of your filter. It will help you determine and calculate the amount of sand to add inside the filter. Most sand filters are generally 13 to 16 inches in diameter. For a 13 inches sand filter, you can expect around 50-100 lbs of sand. If it is something larger than 16 inches, you can add an extra 25 lbs of sand.

For a 20 inches filter, you need around 50lbs of sand. When it is 24 inches you can add 50 lbs to reach about 27 inches. You will be surprised to know that the largest sand filters are around 36 inches. It is easy to choose a filter depending on your requirements.

What Happens if You Add Too Much Sand to Your Filter?

If you add too much sand to your pool filter it can give a lot of pressure on the filter tank. Moreover, it will give a negative impact on the performance of the filter itself. When there is a lot of sand inside the filter it can affect the working of many components. It will be difficult to put the filter back together while putting up everything together. All pool owners must follow the manufacturer’s instructions while adding sand to the filter.

What Happens if You Add Very Little Sand to the Filter?

When you don’t add enough sand to the pool filter, it will not keep the pool water clean. The dirty water will create a pathway through the sand. It may not bypass it completely and will not filter the debris either. As the water becomes cloudy it will be unhygienic for your health.

1. Poor filter performance

The sand filter will work efficiently only if it has the right amount of sand. If your filter doesn’t have enough sand it will not filter all the harmful elements. When the dirt and debris remain inside the pool it can hinder your swimming activities.

2. Dirty pool

If your pool filter isn’t working efficiently it can lead to cloudy and filthy water. Such water can be dangerous for your health.

What Are the Common Problems of Sand Filters?

When you are using the optimal amount of sand in the filter it can still get the following issues:

1. Tank cracking

It is necessary to inspect the exterior of your sand filter every few months. If there are any cracks along the tank it can be difficult to handle. Even if the cracks are thought they can still create a lot of issues with the filter. When the water inside the tank expands it can even damage your filter. Unfortunately once the sand filter will crack it is not easy to fix it.

sand filter

2. High-pressure change

When you put too much sand inside the filter it can lead to higher pressure. Moreover, the sand will become dirty and will raise the pressure. All you need is to backwash the sand filter and try to reduce the pressure. If there are any problems inside the filter it can affect the performance of the filter too.

Many people have this question in mind, what if the sand filter has a lower temperature? It may indicate a blockage at the skimmer or leakage on one side of the pump. The suction pump will suck the water from the pool. While the water will pass through the pump and filter.

3. Waste line leak

The waste line will not work properly if you don’t backwash it. If you feel something is wrong with the gasket it will create a leakage inside the waste line too. Even though you can replace the gasket yourself it can be a challenging thing to handle. It is best to call a technician to save your time, effort, and energy.

4. Multiport valve handle damage

Sand filters make use of a multiport valve for sending pool water for the filtration process. The multiport valves help you rinse and backwash the pool water. If the handle is stuck or broken it is not easy to manage it. However, it is best if you look for a technician and get the multiport replaced at the right time.


If you want to purchase a new sand filter there are plenty of options available at Poolking. However, you need to put in the correct amount of sand to help it work correctly. The user manual will give you some good tips on how much sand for a 13 inch sand filter will work perfectly.

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