Old Motor Seized Need New Pump

[PoolDoc]

Yep. Small pump is mandated. Maximum efficient flow through 1.5" is 40 gpm or less.

https://rainbird.com/sites/default/f...lasticPipe.pdf
https://www.hunterindustries.com/sit...oss_charts.pdf

[PoolDoc]

OK. I looked at your equipment specs. Assuming:

+ 15k gal plaster pool
+ 1.5" ID S-40 PVC piping
+ Pentair 100sft cartridge filter

I'd recommend a

+ Pentair 340042 SuperFlo 1hp 2spd Pool Pump 230 volt OR
+ Hayward SP2607X102S 1hp 2spd Super Pump 230 vold

AND a spare

+ Unicel C-7699 Replacement Filter Cartridge
(if you don't have a spare)

I've liked the Hayward Super Pump for a long time in this sort of application. But the SuperFlo is designed specifically to compete, and is cheaper on Amazon. Both are 230 volt pumps with a toggle switch, so you do not have install complicated 2 speed pump wiring (which most pool guys, and many electricians can't do!). However, if you don't have a timer, installing one will pay for itself in a year or so, even with a 2 speed pump:
+ Intermatic T104 240-Volt DPST 24hr mechanical switch

Once you have it all in:

1. Operate on low speed 8 - 24 hours per day
2. Use high speed when vacuuming, etc.
3. Rotate cartridges in and out, keeping a fairly clean cartridge in place.

Several important points:

+ Both pumps are 240V, not 120V. Make sure you're ready for that.
+ The timer is also a 240V timer.
+ The timer will NOT toggle Hi/Lo, but only On/Off
+ YOU toggle Hi/Lo manually.
+ Dirty cartridges are damaged by large pumps FORCING water through them
+ Clean-ish cartridges work well with low speed pumps; dirty ones, not so much.
+ You should replace the pressure gauge, if is not working.
=====> Winters SS filled gage w/brass internals, 0-60 psi 2.5" Dial +/-1.5% Accuracy, 1/4" NPT bottom mount
+ If your existing cartridge is shot, you should get TWO need cartridges.
+ Unicel cartridges are OEM quality; discount Chinese cartridges are NOT

.

[PoolDoc]

A couple of other things.

+ Pentair models vary. I spoke with Pentair tech support to verify that that specific model has a toggle switch, and does not require special wiring. The support tech was not 100% sure, but thought that OTHER Pentair 2spd SuperFlo pumps may NOT have the toggle. So I'd recommend buying from the link (plus, I get a commission from Amazon).
+ Regardless, you do not want to get into wiring for 2 speed, unless you have a buddy who is an industrial electrician. THEY can do the wiring, right.


And even though the gauge I linked is a GOOD gage, it still is not freeze proof. If you want a freeze proof gage, that requires . . . well, stuff. I've intended, for years, to assemble and sell freeze-proof gauge sets for commercial pools, but I've never gotten around to it.

[dlong]

I had no considered 2-speeds. Are there advantages to a VS pump vs 2-speed pump? Additional savings?

What about the warranty for owner installed vs 'professional' ? In particular the Pentair is 60-days vs 1+ years?

-d

[PoolDoc]

The savings from a 2 speed pump is HUGE. In typical installations, on LO, the pump moves about 1/3 of the water with 1/10 of the electricity (3x increase in efficiency) Also, filters function better with LOW flow, than with HIGH.

VS pumps save a little more, but are more expensive, more complex, and usually work best with electronic pool controls . . . which are ANOTHER point of failure. I'm not a huge fan, for simple pools.