Hi All,
I want to replace my existing 115v single speed pump to a 230V dual speed. My current 3.14sq ft sand filter (300lbs) states the design flow rate is 63gpm. My current pump flows 60gpm. I wanted to get the 1hp Pentair whisperflo but is has a high sf factor of 1.65 and flows 88gpm on high speed. Alternatively I could get the 1.5hp Superflo that flows 66gpm (using 50ft head for calc's).

I have 2 -1.5" suction lines and 3 - 1.5" returns that can easily flow the 88gpm (or I can have 1 suction and 1 return if I close valves - or any combo in between) of the whisperflo but I am thinking it may beat up my sand filter. I was planning on upgrading to a DE filter later but not right now. Since my pool is only 15K gallons (give or take a few K) I am thinking I may be able to get the 1.5HP superflo which will give good turnover at low speed (at least 1 time/day) and won't shag my current sand filter.

Any ideas?

Thanks,
J.