How To Prime a Pool Pump

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When a pool pump is priming, it is purging the plumbing system of air to create a vacuum effect to pull water from the pool, push it through the filter and back through the return line. An inground pool pump should be able to prime itself under normal circumstances. But if you have had to de-pressurize the system for maintenance, i,e, pump motor replacement, cartridge cleaning,  manual priming is helpful to give your pump a head start for priming.

Things You'll Need

Video

Step by Step

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Step 1

Turn off power to your pool pump at the circuit breaker.

Step 2

Make sure your pool’s water level is at least halfway up the skimmer face. Also, remove debris from the skimmer’s strainer basket.

Step 3

A suction side diverter valve allows you to select whether the pump will pull from either the skimmer, main drain or both. Use the valve to close either the main drain or skimmer line to that the pump is only pulling from the other line. We do this to concentrate pump’s suction, to increase the efficiency of the priming cycle.

Step 4

Open your filter’s air relief valve to allow air to escape as we manually prime the pump. You may hear the noticeable hiss of air passing through the valve when you open it, and after the pump is turned on, this is normal. Sand filters may not have an air relief valve, but rather an internal air relief tube which releases pressure automatically.

Step 5

Remove your pump’s strainer lid. To open up the strainer box, 1-turn the two knobs on top of the strainer lid counter-clockwise and 2- swivel the knobs down away from the lid. Note: Some strainer lids screw on instead of having knobs. In these cases twist the lid counter-clockwise to remove the lid off the top of the strainer box.

Step 6

Remove any debris from your pump ’s strainer basket to improve the pump’s suction during the priming process.

Step 7

Fill your pump’s strainer with a hose or bucket until the water sits above the pump strainer’s intake port. Filling to this point ensure the suction pipe is purged of air.

Step 8

Reattach the pump’s strainer lid. You may want to add a new coat of lube to the pump lid’s o-ring to increase the o-ring’s longevity and prevent any future sucking air leaks.

Step 9

Make certain that any valves on the main return line are open. This will allow the pool pump to discharge water to the pool. If this is not open, excessive water pressure that builds up during pump operation may damage parts of the pumping system and may be dangerous.

Step 10

Turn on the pool pump breaker, then turn on the pump.

Step 11

Keep an eye on the pump’s strainer lid to ensure water is flowing. After the initial water, we used to prime the pump flushes through the system, water should begin to freely flow and fill the pump’s strainer basket. If after a minute, water still has not begun to fill your pump, restart from step one in this guide, and if the problem persists, read this guide: How To Determine Why a Pool Pump Won't Prime

Step 12

The air relief valve should still be open. As the pressure builds, air will be released through the relief valve. When water starts to spray out of the valve, turn the valve clockwise to close it.

Step 13

After the pump has primed itself, reset the suction side diverter to pull from both the main drain and the skimmer.

Step 14

If water isn't flowing freely in 30-60 seconds, repeat steps: turn off the pump, bleed off the pressure, reopen the strainer, refill the strainer, and close the lid. Then turn on the pump. You may have to repeat these steps several times to purge the air from the line.

Step 15

When water is flowing through the pool skimmer lines, slowly open the main drain line at the diverter valve. Open the relief valve to allow air in the main drain line to escape. Again water should flow freely in 30-60 seconds. Close the relief valve. If you don't see pressure building on the pressure gauge and a full strainer box, repeat steps 1 -10.

Step 15

If, after repeated attempts, you cannot prime the system successfully, your system has a major leak or blockage. This problem must be resolved before you can prime the swimming pool system.

Step 16

As stated earlier, if  after a minute or attempting to prime water still has not begun to fill your pump, or after your reset the suction diverter valve the pump loses prime, restart from step one in this guide, and if the problem persists, read this guide: How To Determine Why a Pool Pump Won't Prime and How to Identify and Correct Air Leaks 

 

Comments

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(41 to 80 of 143)

InyoPools Product Specialist  Posted: 9/16/2016 

Dom Fiocco - I would shut off the valve to the solar system until the pump is primed than slowing open the solar valve.
 Reply

 Posted: 9/14/2016 

My pool pump won't prime if the valve to our rooftop solar system is open. Any ideas on how to resolve?
 Reply

InyoPools Product Specialist  Posted: 8/15/2016 

Rick - Thanks for the priming tip. It sounds like a great solution for anyone with a significantly elevated pump.
 Reply

 Posted: 8/14/2016 

I tried everything and couldn't get mine primed and FINALLY found a trick that worked that I though worth sharing. Forcing water into the skimmer intake (the inlet from your main drain should probably be closed). I had stuck a hose in it before and still couldn't get it to work, so I wrapped cardboard and tape around the hose to make the hose fit tightly into the inlet from the skimmer, which was a little bigger than the hose. Cranked the water all the way, forcing it up to the pump, which in my case was about 4 feet above the water level. Turned on the pump and it caught within seconds. I am soooo glad to finally find a way that works.
 Reply

InyoPools Product Specialist  Posted: 8/1/2016 

confused - No, you should only add water to the strainer basket for a couple of minutes. It will not fill completely since you have an open system and some water is draining out to the pool. If you are having trouble priming the pool, close off all but one of the suction lines to the pool. Then open the others back up after the pump is primed. Check to make sure that you don't have leaks in the suction lines that are preventing your pump from priming. See our guide on "How to Identify and Correct Air Leaks".
 Reply

 Posted: 7/31/2016 

I am trying to prime my pump. Is it possible that it could take hours to fill the lines through the filter basket? Should the water lines be open or closed? I have them open.
 Reply

InyoPools Product Specialist  Posted: 7/2/2016 

WW - I have not seen a pump operate up and down like that. If it only happens on the Backwash and Rinse modes, the problem is probably in the Waste port of the filter. Make sure that port and the hose from it is not partially blocked. Check the spider gasket in the valve to make sure it is intact.
 Reply

 Posted: 6/30/2016 

I just hooked up an Intel 14" 2800 gph sand filter pump. Back washed, and rinsed fine. In the filter mode however the pump seems to rev up and down and the psi goes up and drops right along with it. It's not dramatic, maybe from 10 to 4 psi back and forth. Any reason why it would do this in filter mode but run smooth in backwash and rinse?
 Reply

InyoPools Product Specialist  Posted: 5/24/2016 

Scott72 - Concentrate first on what you changed. If you pulled the strainer cover off to clean the basket, make sure the cover O-ring is in place. Sometimes, if the O-ring is old and stretched out, it may poke out when you are closing the cover leaving a big air hole. If that is good, try filling the pump trap with water from a hose. You won't be able to fill it but you will put some water in the pipe to the pool. Leave the multiport valve in filter until the system is primed. Turn the pump off and switch to backwash, then switch the power back on.
 Reply

 Posted: 5/23/2016 

I've got an older pool with a Heyward S200 sand filter. I don't have a diverter valve from the main line to the skimmers; just the pump selector lever (backwash, rinse, filter, etc.). According to the instructions on the pump, I am supposed to prime it, then run it on backwash until I had a steady flow of water, then rinse, then filter. I had this thing running great yesterday, opened the basket to empty it, and now can't get it to prime to save my life. Am I missing something? Please help! Thank you!
 Reply

InyoPools Product Specialist  Posted: 5/20/2016 

check valve - The check valve should keep the water from flowing back into the pool after the pump is shut off. So priming would be faster.
 Reply

Anonymous  Posted: 5/18/2016 

How would this work if there is a check valve on the suction side of the pump?
 Reply

Anonymous  Posted: 7/29/2015 

Worked great. Thanks.
 Reply

InyoPools Product Specialist  Posted: 7/24/2015 

prime - Generally you will see a little water/air at the top of the pump basket while the pump is running. I have seen a perfectly smooth top where it looks like no water is flowing but this is an exception. The discharge from the pump would have to match the water coming in on the suction side of the pump. If you have a lot of air in the pump basket (Cavitation) you either have a suction air leak or your pump may be too large and it is discharging the water faster than it can pull it in.
 Reply

Anonymous  Posted: 7/23/2015 

should you see water in your pool pump when its running
 Reply

InyoPools Product Specialist  Posted: 11/4/2014 

creepy backwash - Sound like you don't have sufficient water flow in the filter setting. If you haven't replaced the sand in your filter in the last 5 years, I would do that first. See our guide on "How To Correct Low Water Pressure in Your Pool System" for other suggestions.
 Reply

Anonymous  Posted: 10/30/2014 

My creepy only sucks of backwash. How do I correct this please
 Reply

InyoPools Product Specialist  Posted: 7/11/2014 

Bigredthingy - Try placing Tupperware covers over the input and return holes on the inside of the pool. The pool water pressure should hold them against the holes.
 Reply

 Posted: 7/11/2014 

We already have our pool full and a pump and cartridge filter hooked up, but old cartridge leaks in too many places! I have a new pump and cartridge filter system that we want to hook up and don't know how to stop all the water from pouring out on us while we exchange the equipment! Please, help!
 Reply

InyoPools Product Specialist  Posted: 6/17/2014 

have know clue - Hard to say. Go back and look at everything you might have changed to make sure it is the same as it was - assuming your system was running well before you painted. Check the voltage connections and readings to make sure your voltage is correct. This problem is characteristic of low voltage to the pump.
 Reply

 Posted: 6/16/2014 

my pool was drained five month . was repainted and filled up, primed the pump, and flipped the switch pump came on for twentyfive sec,then cutoff.help me somebody
 Reply

InyoPools Product Specialist  Posted: 6/13/2014 

Tavo - If you tried opening the main drain after you had the system running with the skimmers, and you lost prime, it sounds like you have a leak in the pipe coming from the main drain to the pump. Try soaping up any visible connections between the diverter valve and the main drain to see if any bubbles are sucked into a leak. If not, your leak may be underground.
 Reply

 Posted: 6/12/2014 

I have not been able to prime my pump using the main drain. I let the water run inside the pump basket for at least 20 min but if never filled up. I gave up on the main drain and the pump it's running once I changed to skimmers only. I have try opening the slowly to the main drain but have not have success. My concern is that I ran the water to the main drain for a long time and no luck.
 Reply

InyoPools Product Specialist  Posted: 4/23/2014 

Golden-Hawk - We only sell the rubber flapper as a kit with this valve.
 Reply

InyoPools Product Specialist  Posted: 4/23/2014 

Golden-Hawk - No, it will not hurt the pump to prime for 5 minutes.
 Reply

 Posted: 4/21/2014 

I am using 2" Jandy Check valves to prevent back flow< Is it possible to buy just the rubber flapper instead of the $30.00 kit?
 Reply

 Posted: 4/21/2014 

Hello, I have a 30k pool with dual mains and dual skimmers. The pump is app. 6' above the water line.Both Mains and skimmers have Jandy ck valves to slow run back. The pump is on a auto timer and after several hours of off time, its takes about 5 min to prime the pump. Is this going to damage the pump? Thx,Ken
 Reply

InyoPools Product Specialist  Posted: 4/21/2014 

HH - Most pool systems will drain back into the pool when the pump is shut off. If your pump is higher than normal above the pool surface it will drain more. One way to stop this backflow is to put a check valve in your system after the pump.
 Reply

 Posted: 4/18/2014 

help!
my filter set up always loses the water when shut off, i have to reprime every day.
I can hear buble noise inside the filter, that means some air is entering it and some water goes to the pool.

I suspect there's a leak that the air gets in - but i see no leak at all when the system is running?

Thankss.

 Reply

InyoPools Product Specialist  Posted: 3/27/2014 

Larry - We generally recommend a pump size of 1 HP for your pool size and configuration. I would not install a pump less than 3/4 HP.
 Reply

Anonymous  Posted: 3/23/2014 

Larry I am replacing my old 3/4 hp pool pump to a pentair whisperflow ee 1/2 hp can the new pentair handle my 20,000 gal pool and pump water to my solar panels on my 2 story house?
 Reply

 Posted: 3/19/2014 

It worked. I really appreciate the help. I know where I will be purchasing all my pool needs now.
 Reply

InyoPools Product Specialist  Posted: 3/18/2014 

Stephen - I talked to the Hayward rep and he suggests changing the prime setting in your Ecostar pump from "auto prime" to "3 minutes". Please let me know if this works. Thanks
 Reply

 Posted: 3/16/2014 

I have a Hayward Ecostar pump and a Hayward filter. For some reason the pump will not prime in filter mode. It will prime in backwash, rinse, recirculate...just not in filter. Any suggestions?
 Reply

InyoPools Product Specialist  Posted: 11/6/2013 

Ed - Depending on the height of you pump relative to your pool level, you may have drained most of the water from your suction pipes. Fill the strainer basket with your hose for 5 minutes. Secure the strainer cover and try running your pump again. It might take 5 minutes to prime fully.
 Reply

 Posted: 11/3/2013 

I just drained and cleaned out my De filter. Does it take longer to prime the pump after that? I've tried several times but can't get water to flow.
 Reply

InyoPools Product Specialist  Posted: 10/29/2013 

Kelly B - Sounds like you may have shorted out the motor. See "How To Use a Multimeter to Test a Pool Pump Motor - Winding Resistance" to test the windings or take the motor into a pool shop to be tested.
 Reply

 Posted: 10/27/2013 

My top filter housing cracked causing the water to possibly spray on my motor and lose a lot of water from my system. My motor was trying to start because of the timer without having enough water in the basket attached to the motor. Now I try to prime the pump but the motor turns over for a couple seconds and then turns off. It will continue trying to start if I don't turn the pump off. I tried stuffing a hose and rag in the skimmer basket at the pool to fill the line enough for the pump, with this I had to divert from the main drain to the skimmer a little for the water to fill the pump line enough to get the water to over flow the priming basket to try to get the pump to stay on. I need advise on what to try next. Do I need to make sure the pressure from the filter is zero before trying this again? The impeller spins and seems free of debris. The pump wants to start but something is making the motor shut off for a few minutes until it tries to start again and again. Thanks!
 Reply

InyoPools Product Specialist  Posted: 7/18/2013 

Kelly - Consistent bubbles in the return jets is an indication that you have a suction leak somewhere ahead of the pump. I would look at any new connections you made in installing your new pump. As long as you have good flow you should be all right now. If your pressure gauge is showing 0, you either have a bad gauge or your flow isn't as good as you think it is - probably due to the suction leak. See our guide on "How to Identify and Correct Air Leaks" for more information.
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 Posted: 7/17/2013 

We have an in ground pool and just purchased a new pump and filter this year. We hooked everything up and were reading around 9 psi with great suction and return. We vacuumed, then cleaned pump basket, backwashed and rinsed then returned to filter and have 0 psi now. Weird thing is we still have suction and good pressure of water returning to the pool. But there is a lot of air bubbles coming from our jets. I'm at a lost. Our main drain is closed...we never have used it. I don't want to ruin our new pump or filter. Please help!!! Thanks
 Reply