Aim for a 1 to 2 psi increase. It won't happen immediately - maybe a half hour or so. So, don't add too much DE too quickly or you will overshoot your target again.
Re: Topping off a large sand filter
Aim for a 1 to 2 psi increase. It won't happen immediately - maybe a half hour or so. So, don't add too much DE too quickly or you will overshoot your target again.
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