I need to order a new pump and I am narrowing down my selection. I live near Houston.
18000 gallon in ground with Spa
Hayward DE 60 sq ft.
in line chlorinator
Polaris booster pump PB4-60, Polaris 380
Here is my short list and logic:
1) Superflo VS 1.5hp uprated variable speed - the intermediate speeds will surly be enough flow for filtering, but will it be strong enough for the spa jets? I think high speed will be about 60 GPM. Built in timer saves the cost and installation of a two speed timer. I am concerned this pump might be a little cheap and not last as long as a Whisperflo.
2) Whisperflo 1.5hp full rated 2 speed (WDFS-6) - sized so the low speed will move at least 25 GPM. At high speed I estimate 90 GPM which seems more than enough
3) Whisperflo 1.0hp up rated 2 speed (WDFS-4) - I am concerned the low speed will not move enough water but high speed should be OK but not great.
This is all predicated on the total dynamic head which I guess is 50-60 at full flow. But I really don't know.