Quote Originally Posted by mas985 View Post
Best I can tell, the current pump is producing around 52 GPM @ 54' of head and a new 3/4 HP Superpump would produce around 32 GPM @ 21' of head (note head loss is not a constant and depends upon flow rate). The lower flow rate is because the current pump is a full rated pump and the Superpump is an up rated pump.

Also, sand filter are much more robust than most filters so although your current pump is exceeding the recommendations, it is probably not enough to really damage the filter. However, the filter is very small and you might want to up size that at some point.
Quote Originally Posted by mas985 View Post
Sorry correction, the new Superpump would have an operating point around 44 GPM @ 39' of head. I used the wrong pump above.
Would you mind explaining a bit how you came up with those numbers, more specifically the GPM for the current pump and the feet of head for both...

As far as I can tell, the sand filter has a max flow rate of 20 GPM, if it was currently at 52 GPM wouldn't that be kind of through the roof? And also can't 1.5" piping only safely handle around 47 GPM?

Thanks again for your help.