I just got a Hayward SP2303VSP to replace a 3/4HP single speed 3400RPM pump. I'm still playing around with figuring out what speeds and times to use. I don't like the idea of letting my pool water sit with no movement so I thought I'd set 1000RPM from 7pm to 7am but I've noticed that the filter gauge isn't even reading anything and I can't feel any water coming out of the returns in the pool. Am I just wasting electricity? Is there any conventional wisdom on how to determine a minimum RPM threshold?