Air in pump when below 3100 rpm

Metalman23

Bronze Supporter
Apr 21, 2018
112
Central CT
Whenever I run my pump at full speed, there's no air in it, but when I reduce the speed to 2100 rpms or 1300, a lot of air gets in, it probably takes a day or two.

Then if I run it at full speed again, the air will get worked out in a matter of minutes, is this a suction side air leak?

I sealed the union in front of the pump with silicone, it's still happening, I checked the strainer lid gasket, but nothing seems to be fixing it
 

Metalman23

Bronze Supporter
Apr 21, 2018
112
Central CT
Ok this morning the water level in the pump strainer was down about 2" or more, barely covering the strainer basket, I don't imagine that's supposed to be that way
 

zea3

Mod Squad
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Jul 10, 2009
12,465
Houston, Texas
No, it shouldn't get that low. Have you put silicone pool lube on the pump lid o-ring? Make sure the pump pot drain plug is snug. This video shows other ways to check for a suction side leak.
 

Metalman23

Bronze Supporter
Apr 21, 2018
112
Central CT
I checked the drain plugs, they're tight, I put a new oring in, put lube on it, I put so much silicone on all the fittings on the suction side there's no way they leak, it's driving me crazy
 

duraleigh

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Then if I run it at full speed again, the air will get worked out in a matter of minutes, is this a suction side air leak?
No. It is a perfectly normal characteristic of a VS pump and is of no harm to your pump or pool.
 

Metalman23

Bronze Supporter
Apr 21, 2018
112
Central CT
What I don't understand is do people who have VS pumps and run them at low speeds 24/7 have this issue?

Now, when I turn the pump on it does its priming cycle, which is about 2700rpm for 3 minutes, before going back down to 2100rpm, but the strainer basket never fills up with water there's a lot of air in it,
No. It is a perfectly normal characteristic of a VS pump and is of no harm to your pump or pool.
 

zea3

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If your pool water is low it will also suck in air at the skimmer, which collects in the pump. Top off the pool and see if the problem corrects itself.
 

duraleigh

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I caNt run it at full speed or it'll suck air, but I'm trying to run it at 2100
Now that sounds like a suction side leak. YOu should be able to run your pump at full rpm and not suck any air. Where is it sucking it from?
What I don't understand is do people who have VS pumps and run them at low speeds 24/7 have this issue?
Well, I doubt very few people run a VS on low 24/7 but, yes, If you ran on a low VS speed 24/7, the you would always have air in the pump basket.
 

Metalman23

Bronze Supporter
Apr 21, 2018
112
Central CT
Now that sounds like a suction side leak. YOu should be able to run your pump at full rpm and not suck any air. Where is it sucking it from?
Well, I doubt very few people run a VS on low 24/7 but, yes, If you ran on a low VS speed 24/7, the you would always have air in the pump basket.
Interesting,

What I mean when I say it sucks air, I vacummed to waste a couple days ago, the water level dropped a lot, when I try to run it full speed it sucks air from the skimmer, I'm refilling it, now, once it's at the proper level that won't be a problem anymore
 

duraleigh

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Yeak, so as zea is saying, your water can't be so low in the skimmer that it sucks air in there. Unrelated issue to your VS issue.