Need to replace a failed 1HP Northstar pump again (went through 3 in 13 seasons) and considering going to a 2 speed or VS pump this time. When looking at flow rates, pipe restrictions, etc. - having a hard time figuring out exactly what my plumbing will allow so I can determine best pump size to go with.
Here's my current setup:
Pool size is 20' x 40' and approx. 35,000
1 1/2" from Skimmer
1 1/2" from floor drain
* Both join at valve that outputs 2" PVC about 16" before pump inlet.
2" PVC IN
1 1/2" PVC OUT
Sand Filter - Rated at 60 GPM:
1 1/2" IN
1 1/2" OUT to VALVE 1 (All lines remain 1 1/2" from here on out)
> Universal Wall Fitting
> Valve 2
> Wall Jets
> Valve 3
> Stair Jets
> Swim-out Jet
Any idea what HP pump I should actually have - or if I should upgrade to 2 speed or VS (electric rates are $0.115)? Are there any choke points I can relieve, or am I limited by all the 1 1/2" pipe used by the original builder? Also any thoughts as to why I'm burning out pumps fairly regularly?
I typically run 24 hrs a day for 6 months and frequently shut down flow from either the floor drain or the skimmer depending on tasks being performed (shut down skimmer to circulate chemicals - shut down floor drains when there's an abundance of leaves or when pool cleaning with skimmer suction powered vacuum).
Any feedback would be appreciated.