Filtration & Circulation /
How to Prime a Pool Pump After Maintenance
Learn a safe, step-by-step way to prime a pool pump after maintenance, restore circulation, avoid common mistakes, and know when to call a pro.
Archive date: this article was written for PoolSkimmer on Oct 7, 2026 and given the earlier archive date of Apr 6, 2026 so the blog reads as an organized archive. It was not published on that date.
The meaning of pump priming
In simple terms, priming is what you do to get the air out of the suction side and the pump so water can circulate. This becomes necessary after any pool maintenance work; opening the basket, tending to a lid O-ring, adjusting a valve or draining a line for a clean will let air in. Without proper priming, the flow is compromised and the circulation system for the pool and spa will not function as it should.
Safety is paramount before you start. Ensure the work area is dry and there are no electrical hazards in plain sight. Should you come across damaged wiring, a breaker that won’t stay on, or the smell of something burning, put down your tools and contact an electrician or a pool pro. Otherwise, don your gloves and eye protection, and be sure to adhere to the chemical labels and equipment manual.
How to prime the pool pump: a step-by-step guide
First thing is to shut the pump off at the breaker or switch. One should never reach into operating suction equipment or open the skimmer basket while the pump is running.
Proceed with the following:
- Verify the pool water is at a level suitable for normal skimming.
- Take a look at the plumbing, drain plugs, basket and the pump lid for any sign of a leak, cracks or debris.
- Clean the skimmer and pump basket if they need it.
- Put the lid back on. Make sure the O-ring is in place and the lid is snug but do not force it.
- Open up the return and suction valves to their operating position.
- Where the manual permits, pour some clean pool water into the strainer pot prior to closing the lid.
- Switch the pump on and observe the clear lid for water movement.
For vacuum hose priming during maintenance, fill the hose with water beforehand to minimise the air in the line. Leave the end under water until the air is gone, then make the connection as directed.
Signs of a good prime
You will know the job is done when the pump is running steady rather than chattering loudly, and the air bubbles have subsided since startup. The basket should be full of water and the return jets putting out a strong, even flow. An occasional burp of air at the start is nothing to worry about, but if the pump is noisy, runs dry or keeps pulling in air, you may have a blockage in the basket, a bad impeller or an air leak on the suction side. In a few minutes the system should still be holding its prime.
Mistakes to steer clear of
Oversights are the usual cause of trouble. Do not let the pump run dry for any length of time, and never put your hand in the basket with the power on. Check that the O-ring is not dirty or worn and that the lid is tight. It is also easy to forget to open a valve once maintenance is over, or to dismiss a seep or crack as inconsequential. And while you are at it, do not try to guess at dosing or mix chemicals. If the water is in any way unsafe or cloudy, swimming is off limits until it is fixed.
Time to call in a professional
If you have made several attempts and the pump still will not prime, or if it gives up shortly after you turn it on, it is best to leave it to someone qualified. You would be wise to seek professional assistance for any of the following:
- A motor that is humming but refuses to engage
- Overheating, odd noises or the system shutting down on you
- Filter pressure that seems off after you get things going
- Any visible damage to the housing or plumbing, or air leaking from the unions and valves
For next time
A little routine upkeep goes a long way in preventing these issues. Keep the baskets empty (with the pump off), monitor the water level when the weather is hot and give the O-rings and valves an inspection after service. Stick to the instructions for your particular model. Provided the pump primes well and you have your circulation back, you can carry on with normal use. If not, it is better to halt your efforts than to put the pump or the water quality at risk.