How often to change pool sand?

I backwash my DE filter once a month and then open and completely clean the fins at least once a year.

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his year the water has never really gotten crystal clear like it has in previous years and I'm thinking the sand may need to be changed.

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you sure you're managing it correctly?

actually slightly-dirty sand can do a better job filtering small particles than clean sand.

also you can add some DE to the pool strainer for additional filtering but you'll have to do this every time you backwash since it gets washed out.

speaking of, how often are you backwashing?

do you keep an eye on the water pressure and backwash whenever its 10% higher than normal?

do you ever open the impeller and remove any debris or tiny rocks that are caught up in that? i do that at least once a year to keep the pump running smoothly.

we bought this house 7 years ago and replaced the pool liner at the same time. we've never touched the sand filter. it just...works.

i have no plans to change the sand and the only time the pool doesn't look crystal clear is when i let the chlorine levels get too low or i need to add baking soda to balance the pH.

5 years, maybe 7.

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Change your sand out for glass. Much smaller filtration size and never has to be changed.

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A friend of mine just did this. I haven't talked to him to see what he thinks about it but he liked the "not having to do it again" idea.