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Yes. After several years the sand begins to round out like river stones and become less effective. It can also become caked with oils, calcium and other debris from the pool. How often you need to change the sand in your filter will depend upon different factors such as running time, water chemistry and filter size. A good rule of thumb is to change it about every 3yeats. When you empty the old sand from the filter, that is a good opportunity to check the laterals and other internals of the tank for wear and tear.

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Q: Is changing sand important in a sand filter?
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