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How frequently should I change the sand in my sand filter?
The sand stays in the filter for a long time. Five to ten years if you are using chlorine. If you use a biguanide sanitizer, you should have the sand changed every 3 - 5 years. Believe it or not, a sand filter works better when it's dirty, so it's important not to backwash it too often. A clean sand filter will trap a particle 50 microns in size, while a dirty sand filter will trap a particle only 20 - 25 microns in size. Sand should be chemically cleaned at least once a year, twice if you're using a biguanide sanitizer.
Question Related To: Sand Filters, sand filter maintenance, Sand Filter