Ok guys, a little help with my system. Was hoping Mark could chime in, but anybody who has ideas feel free.
So a little background first. I have a 14000 gallon IG plumbed with:
1.5 inch pipe on a skimmer run back to the pump
1.5 inch pipe on a side wall suction run back to the pump. Both suctions tied together at a jandy valve before going into the pump.
3, 1.5 inch returns
Originally, I had a 3/4 HP Hayward super pump. It died last season so I decided to get a 2 speed. Bought a pentair superflo 1 HP. The idea was to run it on low to save on power. Well, unfortunately, there's not enough flow for my IC-40. It needs 20 gpm, but practically it may need 22-23. Bottom line I have to run it on hi to make chlorine. Using Marks spreadsheets and calculations, I have somewhere around 55 feet of total head based on a 17 psi pressure with the pump on high on a clean sand filter (17*3.21). Need to lower the total head.
The 1.5 inch pipe I can't do anything about. However, I can do something about the size of filter I have. The builder put one in waaayyy undersized. It's a Hayward S180T. Basically 1.75 sq ft and a 32 gpm rating. I needed to upsize the filter from day one, just haven't done it.
So to get to my question, 2 really.
1) if I up size the filter, can I lower the total head to get 22-23 gpm on the system
2) what size filter would I upsize to based on a 14000 gallon pool and a 1 hp Superflo 2 speed