Upgrade recommendations for replacing 14" Intex sand filter combo?

[Pappy]

From a different thread:

The WhisperFlo is almost certainly too big . . . unless you get at least a 24" sand filter.

I expect to throttle the pump and/or run the pump on low. I have a valve for that purpose ordered. The owners manual has flow/head curves that show the pump moves 45 GPM max and about 15 GPM @ 20' on low. High speed moves 95 GPM max, 85 GPM @ 30' and about 22 GPM (close to what I need) 80'.

Look at the differencee between these bulkhead fittings:

Hayward SP1023 bulkhead fitting
Hayward SP1023G bulkhead fitting

Please let me know which bulkhead you use, and it works.

The difference between SP1023 and SP1023G is the inclusion of a "sandwich washer" in addition to the standard washer with the -G. I think I'll be okay with the non-G fitting. If they leak, I'll order the sandwich washers (assuming I can) or return the non-G fittings and order G type.

[Pappy]

So I've been looking at PVC thread sealant. I have lots of experience with threaded metal pipe & fittings, and glued PVC, but not so much threaded PVC. I was thinking I'd just use teflon tape but Lasco says don't. There seems to a bunch of conflicting advice on the ww-interweb. Can you believe that? About the only thing that most agree on is don't use petroleum based products because they can attack PVC. Any experienced suggestions on what to use? Teflon or this - https://www.amazon.com/Plasto-Joint-...ct_top?ie=UTF8 - ?

Also, since I'm kinda worried about overloading a plug-in Kill-a-Watt meter, I'm thinking this - https://www.amazon.com/gp/product/B0...AKNUUM9N&psc=1 - is the ticket. 1% claimed accuracy.

[PoolDoc]

The meter looks OK. I'd want to compare it with something else once it was in operation.

I've never used Plasti-Joint. It may be great. However it looks a bit small to be using on 1.5" and 2" threads. Here's what I used the last few years:

Rectorseal 31551 1/2 Pint Brush Top Tru-Blu Pipe Thread Sealant

[Pappy]

The meter looks OK. I'd want to compare it with something else once it was in operation.

Even if the reading is not accurately calibrated, it should give an accurate comparison between the 2 pumps - I'd think.

And thanks for the tip on the Rectorseal.

[Pappy]

I had time to check the Intex flow rate this morning. It pumped 55 lbs of water in 15 seconds. That's about 220 lbs/minute at 8.34 lbs/gal. I figure that comes to roughly 26 GPM.

This is what the meter reading was during the test.

[PoolDoc]

OK. Unless that pump has a capacitor, the calculator is showing VA, and not true power. PF for fractional inductives seems to range from 0.75 to 0.9.

And, your 2150 GPH rated pump pumped an actual 1560 GPH, or about 75% of it's rating.

This is one reason it is so hard to optimize residential pump + filter sets: the engineering data is missing or wrong!

Still . . . this is all very interesting.

[Pappy]

your 2150 GPH rated pump pumped an actual 1560 GPH, or about 75% of it's rating.

True. I kinda wonder what it would flow when freshly backwashed. I also believe it cannot be very efficient, because when the filter basket gets cleaned, and is full of air, the pump won't prime. The air bleed valve at the top of the filter basket has to be opened to release the trapped air.

As for the meter, 116V x 4.2A = 487.2W. The meter is reading 482.7. Is that difference due to significant figure rounding, or true power?

AND, the plumbing got done for the new Pentair/Hayward system. I have to get more wire, we decided to move the pump/filter to a different location, farther from the power source, and I need wiring that is about 4' longer.

[PoolDoc]

If the difference between VxA and W were true power you ought to be seeing a gap of at least 40 watts. That would STILL be a PF > 0.9, which would be exceptionally high, without capacitor correction.

As far as additional wiring, if you use twisted AND soldered connections, you can simply splice a piece on. I would not used merely twisted and nutted connections for such a splice. (I assume you know to use rosin flux and not acid flux?).