Whenever you carry out a water change in your hot tub, you could possibly create an airlock whilst filling. Here’s some tips on how to prevent air locks, and deal with them should they arise:
- Make sure all your jets are turned to the on position (usually by turning them clockwise).
- Always fill your spa from the filter bucket or in the footwell. These are the lowest points accessible within the spa.
- Water will go to the lowest points through the suctions in the footwell or filter bucket first. As the level rises, so too will the air, forcing it out of the suctions and jets.
Once your spa is filled and you fire it up, be sure to turn on all the pumps to force out any remaining air. Most pumps come fitted with a bleed line, to help draw out any remaining air from the pump wet end.
If a pump is not producing water pressure, but you can hear it running, there may be air still trapped within the wet end or pipe work leading to/from the pump. To help force this through, you simply want to loosen the union connecting the hose to the pump wet end slightly (video below, no reset button on EU pumps) to allow the air to bleed out. Once you have water coming out, the air should be cleared, and you can tighten the union back up.