Replacing pump/motor - What to look for?

ToddGak

Active member
May 19, 2018
32
Saratoga Springs, NY
Last summer we bought a house with an above ground pool in upstate NY. The pump (STA-RITE ABG4E-2A4) was very loud (kept me awake the first couple of nights), not well protected from the elements, etc. I want to replace it. I'm just not sure what to look for, and I'm not 100% sure it was the appropriate pump for the filter (SPARCO SF.... 40? Not quite sure).

How should I choose a new pump? Motor HP? I see lots of motor/pump combinations, but are they ever sold separately?

Thanks
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
41,939
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
You could change the motor to a 2 speed, 1 HP motor. If you use a timer you may need to change that if you wish to set the timer for both high and low speed.

I would suggest calling Inyopools and discussing with them your setup and your desires and see what they recommend.
 

ToddGak

Active member
May 19, 2018
32
Saratoga Springs, NY
So... I contacted InyoPools and I'm now more confused than before. I used the chat a few times with different questions and ended up getting conflicting information from different agents. I was told at different times:

1. You don't want to go above a 1HP pump for any above ground pool (which conflicts with their pump sizing guide)
2. I should go with a new Pentair Dynamo 1-1/2 HP pump
3. The Pentair above would overwork my SD40 sand filter
4. The SD40 sand filter is too small for my 18' x 30' x 4' deep above ground pool and I should go with a new 1-1/2 pump and larger filter to go with it
5. (from another site) The SD40 is just fine for my pool and I should get a new 1 HP pump

I wouldn't mind having the larger capacity of a new larger pump and filter combo, but I don't want to spend more $$ for the up front cost and on operating costs of the larger motor if the SD40 with a 1 HP pump is the right size.... Confused......
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
41,939
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Let me ask @InyoRob to check with you.
 

ToddGak

Active member
May 19, 2018
32
Saratoga Springs, NY
Thanks! I should add that the reason I started this project is because the motor of the existing pump is old, had water getting into it, and the motor shaft is rusting and starting to flake apart. Other pool owners who heard it operate said it sounded like a motor that was about to fail.
 

InyoRob

Well-known member
Feb 27, 2017
138
Longwood/FL
1) Someone may have been confused about the question. You can use a pump that's higher than a 1HP on an above ground pool.
2) You can use a 1.5HP Pentair Dynamo pump.
3) Pentair packages the 1.5HP Dynamo with their SD40 sand filter. So those two items will work together. However, a 1HP is more ideal because of the lower flow rate and stress on the filter.
4) The SD40 can handle an 18'x33' above ground pool.
5) Again, the SD40 and a 1HP pump are sufficient. If it were my pool, I'd go with the SD60 and a 1.5HP 2-speed pump. This way you wouldn't have to clean the filter as often. You'd also take advantage of the energy efficiency of a dual speed pump.
 

InyoRob

Well-known member
Feb 27, 2017
138
Longwood/FL
I would agree with that. The sand filter won't work as well with the increased flow. They do a better job when the water isn't being forced through them so quickly.
 

ToddGak

Active member
May 19, 2018
32
Saratoga Springs, NY
One more question (I think):

In a 2-speed pump system, how do I calculate energy savings? For the Dynamo 340206 I am having trouble finding data for low speed operation. The current draw on low speed is a little more than 1/4 the draw on high speed, but I'm unsure how long I'd have to run on low speed to cycle all my water through.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
41,939
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
A 2 speed pump, on low speed, will pump about 1/2 the flow rate, using about 1/4 the electricity versus on high speed.
 
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mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
41,939
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Water 'turnover', is a myth. Your water chemistry keeps the pool clean and clear, not the filter.
 

mas985

TFP Expert
LifeTime Supporter
May 3, 2007
14,398
Pleasanton, CA
Pool Size
20000
Surface
Plaster
Chlorine
Salt Water Generator
A two speed pump on low speed will use about 1/4th the energy as high speed. So you will save about 75% in energy costs.
 
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