Filtration & Circulation /
How to Prime a Pool Pump with a Sand Filter
To prime a pool pump with a sand filter, turn off the pump, clear the baskets, fill the pump housing with water, set the valve correctly, and watch for steady flow.
Archive date: this article was written for PoolSkimmer on Oct 24, 2026 and given the earlier archive date of Jan 2, 2026 so the blog reads as an organized archive. It was not published on that date.
To prime a pool pump with a sand filter is to fill the housing with water so the unit can begin to circulate pool water through the system. There is a straightforward way to do this safely: shut down the pump, see that the skimmer and pump baskets are empty of debris, put water in the pump, make sure the lid is on tight, have the valve in the right position and then start it up, keeping an eye on the flow.
Pre-priming checks
Before you go about priming, there are a few things to verify. The first is that the pool has sufficient water for the skimmers; if the level is low the pump will be starved and priming becomes a chore. You also want an open and unobstructed path for the water.
Make sure of the following: - Both the skimmer and pump baskets are clean - The sand filter valve is where it should be for operation - Suction and return valves are open - There is no debris in the way at the inlet or in the lines
Always power down the pump before you get to work on the skimmer basket or the pump housing. And when you are dealing with any debris, wear the proper PPE and consult your equipment manual.
Step by step procedure
1. At the control panel, turn off the pump (use the breaker if necessary). 2. Inspect the baskets in the skimmer and pump for cleanliness. 3. Carefully remove the pump lid and top off the housing with pool water. 4. Put the lid back on to ensure a good seal. 5. Double check that the sand filter is set for normal circulation and not left on backwash. 6. Get the pump running and observe the return jets, the pressure gauge and the basket area. 7. Once you have a steady flow, let it run and look over for any air bubbles or leaks.
Some air at the outset is to be expected, but you want the pump to hold its prime and not take on more.
Troubleshooting a stubborn pump
Should the pump be making noise, show weak flow or lose water in a hurry, cut it off to prevent overheating. It could be a number of things: a closed valve, a clog in the skimmer line, a loose lid or a worn out seal. If you have a multiport valve, be certain it is in the right setting before another attempt. Do not put force on the handle; stick to what the manufacturer says.
Do not try to prime it for long stretches. A dry run can do damage to the pump. Make your basic checks and if it does not happen quickly, stop.
Time to call in a pro?
If you have gone through the motions – checked the water level, the lid seal, the baskets and the valve – and still cannot get the pump to prime, it is time for a qualified technician. This is especially true if you are hearing a grinding motor, suspect an elusive air leak, or are faced with electrical issues or a tripping breaker. Leave the electrical work to them and never put your hands in operating suction gear.
Maintenance best practices
The safest routine is one of regular upkeep. Clean the baskets, check the water and inspect the lid and seal for any sign of wear before you fire up the pump. Set the sand filter correctly and if the flow is anything but stable, turn the pump off. Until the water is circulating as it should, the pool is not for swimming. Be sure to follow the chemical labels and the manual for your particular setup.
Sources and further reading
- [Hayward: Weekly pool maintenance](https://www.hayward.com/maintenance/weekly-pool-maintenance)