Any good way to verify the pool pump is working adequately?

smachin1000

New member
Oct 25, 2021
4
North Scottsdale AZ
Pool Size
15000
Surface
Plaster
Hi All,

Bought a new house with a 15,000 gal pool. The pool has a Centurion 2HP pool pump and a Triton 2 sand filter. I am doing the pool chemistry myself every week (usually muriatic acid & shock), the the water is clean. The pool as those popup pool cleaners at the bottom of the pool. All the outside equipment looks pretty old (paint faded etc.), might be 10 years old, got no records from the previous owners.

The problems I am seeing are with the pool cleaning, I do see the popups pop up and run through their cycle when the pump is running, but there is quite a bit of sand/dirt build up at the bottom of the pool near the 2 main drains, it's as though they are not sucking in anything at all.

I do see pressure at the skimmer. All filters are clean. The sand filter has a pressure gauge, when the pump is running, pressure is lately only hitting about 8 bar, way below the correct operating range of 22 to 34 bar. Originally I had a guy out to look at the pressure issue, he recommended replacing two O ring seals, I did that, he did an air bleed and back pressure wash, and for a while the pump pressure was OK (seemed good for about 3 weeks or so).

I then had another company come out to look at the low pressure problem, and all they recommended was replacing the pump & all surrounding equipment, $2,600.

So with all that, is there a way I could do some kind of test on the pump to verify it's working with enough pressure before I look at a big spend of pump associated equipment replacement?

Thank you,
Sean
 
If the pump is running and producing flow rate, it is working. However, there may be other problems such as clogged lines.

Please post all of your equipment in your signature. Also, a picture of your equipment would help greatly as well.


BTW, I believe those pressure readings are in PSI and not bar. 34 bar would be almost 500 PSI. 8 PSI is quite low and would indicate a suction side blockage of some sort. Either a clogged impeller or suction line.
 
Hi, thanks so much for the reply. Yes, those pressures are in fact in PSI, I re-checked my meter (it has units for both). I updated my .sig, and have attached pics of my equipment and one showing that sand/dirt problem at the pool bottom I want to resolve.

If the problem is a clogged impeller or suction line, how would I go about confirming those?
 

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It doesn't look like there is any valve automation. Normally with IFCs the valve will automatically adjust when cleaning the floor and then switch back to skimming and normal returns when done. Is there a separate skimmer and set of pool returns besides what is part of the IFC system? The pump may not have enough power to run everything at once.

Also, I can't really see the plumbing very well. Can you get a front view of all the equipment together? I need to be able to see the pipe routing and all the valves.

As for the clogs, first check that the pump basket is empty and that there is not anything stuck in the impeller inlet (hole at the bottom of the pump basket).
 
Thanks again for the response. I verified there is some suction at the skimmer, basically no suction at all on the 2 main drains at the bottom of the pool. I've attached more pics of the plumbing. All filters are clean, the filter basket on the main pump and it's O ring I replaced recently. I also felt no debris blocking the impeller input to the pump.

Note there is also a 2nd pump that runs a small waterfall (that's the one on the right), but all that system works fine.
 

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The valve in the picture below (red arrow) is most likely between the skimmer and the IFS drains. When the IFS is running, the skimmer should be shut down so that the drains have the maximum amount of suction. However, the position of the valve right now is probably adding restriction because it is closing off part of the main suction line. The handle should never be pointed away from the center line. Also that valve should really have an actuator on it like the IFC does to the right so it automatically changes when the IFS runs.

1635430727258.png
 
Forgot to mention that most IFSs have a leaf trap somewhere near the pool. Make sure that is cleaned out.
 
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