Adding media to sand filter

You don't say what specific filter you have. Below is an example of what should be in your filter manual. It should tell you the amount of free board depth you need. It varies by filter.

 
A properly functioning sand filter should lose very little, if any sand during normal operation. If you had added the proper amount of sand last year and nothing unusual happened that caused it to lose a significant amount of sand then you shouldn’t need to add sand now. “Topping off the sand filter” isn’t a normal maintenance item.
 
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