How to Tell If Pool Filter Sand Needs to be Replaced

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Change the sand in the sand filter every five to 10 years when using chlorine bleach to shock or sanitize the pool. Change sand every three to five years if using a biguanide sanitizer for the pool.

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Pools add fun and relaxation to your backyard. You can swim for exercise or lounge in a raft. Pools also need frequent cleaning and maintaining to keep a proper pH level and water filtered to keep dirt and bacteria out of the pool. Sand filters are one type of pool filter used. The sand traps dirt and grime as water from the pool runs through it. Sand normally works better the more dirt it collects, but eventually the sand needs to be replaced.


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Step 1

Watch to see if backwashing is needed frequently, which could indicate that the sand is becoming too muddy or dirty to filter effectively. Backwashing is a process of cleaning the filter sand. Your pool manual gives you instructions on how to do this procedure.

Step 2

Check for dirt or grime buildup in the bottom of the pool. Excess dirt that is not removed when the filter is working could mean the sand has gummed up and needs to be replaced.


Step 3

Watch for cloudy water. If the water is still cloudy after adding and testing chemicals, the sand may not be filtering properly. Pools that are used frequently or by many people experience more dirt and bacteria than those used less often. Pools near trees may have pollen or residue from leaves that invade pool water and gum up the sand in the filter.