Symptoms
- Jets have little to no pressure
- Some jets work while others don't
- Sputtering or air-mixed water from the jets
Likely causes
- CommonLow water level below the jet intakesWater needs to stay above the skimmer and jet lines to maintain pressure.
- CommonDirty or clogged filter restricting flowA clogged filter reduces the volume of water the pump can circulate.
- CommonAir trapped in the plumbing linesAir locks are especially common after draining and refilling.
- PossibleClosed or partially closed jet diverter valveDiverter valves control which jets are active and can be left in the wrong position.
What to do
- Check and top off the water level so it covers the skimmer and jet intakes fully.
- Clean or replace the filter cartridge, since restricted flow is a leading cause of weak jets.
- Bleed air from the system by loosening a union fitting slightly near the pump until water flows steadily out, then retighten.
- Check any diverter valves and turn them to direct flow to the jets you're trying to use.
- Individually inspect each jet fitting for clogs or debris, removing and cleaning if the jet itself seems blocked.
- If pressure is still weak after these checks, the pump may be undersized for demand or have an internal issue needing a technician.
Tools and parts
- Wrench (for unions)
- Filter cleaning supplies
Hot tub filter cartridgeSearch: “hot tub replacement filter cartridge”
When to call a pro
If jets stay weak after ruling out air, filter, and water level, a spa technician can check pump performance and plumbing for a deeper blockage.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.