If you ask in a place that wants to sell you the sand
it's usually once a year.
Common sense and my own experience says every 3 or 4
years works just as well.
I don't know what cleaner gunk is but if you're using
it to clean the sand, you are wasting your time and
Oh, also I'm in NJ, the pool gets used 4 months a year.
That could make a difference.
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