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Old 08-29-2016, 11:03 AM   #1
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Well pump seems to be getting weak


I've got a Grundfoss submersible well pump (1/2 HP if I recall correctly) that can only maintain about 35 psi when I water my garden. If someone flushes a toilet in the house while watering, the pressure falls below the 30 psi cut-on point and the pressure control switch run-dry breaker kicks out. Then, no water at all of course.

We're not in a drought and I doubt the well is running dry. I can water the garden all day at 35 psi. It just seems like the pump itself is getting weak and can't keep up with a demand of more than a gallon or so per minute. The well qualified at 6 gallon/min, but that was 25 years ago. The pump is 14 years old. Do pumps ever get weak before they fail completely? Our first pump just died suddenly.

BTW, the well is 305 feet deep with the pump set at about 250 feet. Static water level was 40 feet when the well was qualified.
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Old 08-29-2016, 01:28 PM   #2
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Re: Well pump seems to be getting weak


What is the psi of the bladder in your pressure tank?
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Old 08-29-2016, 05:26 PM   #3
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Re: Well pump seems to be getting weak


Tank was charged with 28 psi. Haven't checked it for a while, but the switch definitely turns on the pump before the bladder hits the bottom of the tank and the gauge goes to 0.

The basic problem I have is the pump can't deliver enough water at the pressure where the tank is emptied of water. It used to.

1 gallon per minute at 35 psi seems awful weak.

And it will finally pump the tank up to 50 psi if no water is being used. But it takes quite a long time.
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Old 08-29-2016, 06:38 PM   #4
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Re: Well pump seems to be getting weak


Check the pressure
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Old 08-30-2016, 08:54 AM   #5
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Re: Well pump seems to be getting weak


Your pump filter screen may be blocked with iron/calcium---

That is what has killed my pump in the past---I suggest you call your well guy (unless you have the tools and skills to change the pump yourself)
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