I have the hayward 21 inch sand filter and thinking about going to a bigger filter but everything bigver says inground. Is there any difference in an above ground sand filter and an inground sandfilter?
I do not think there is any difference for filters above/in ground. You are currently right at the size we would recommend.
Why do you want to go bigger? To reduce how often you backwash? That is the only reason I can think of.
You have to also make sure you do not go too big or you may have trouble adequately backwashing.
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