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Not Filtering
Here is a troubleshooting guide that should help to diagnose any filtering issue you are experiencing with a Lay-Z-Spa.
Step 1 - Check if filter cartridges are dirty or perished
Please follow these steps:
- Remove the filter cartridges
- Check them for any dirt or dissolved parts.
- Always make sure the cartridge is clean and dry when you replace them.
- You should ideally change or clean the filter cartridge after every use.
Step 2 - Check if the filter housing is disrupting the water flow
Please follow these steps:
- Remove the filter housing and check the black membrane inside is not perished or bent.
- Try running the hot tub without this attached and see if water flows correctly. You may need to replace the filter housing.
Step 3 - Check if the debris screens and pipework are blocked
Please follow these steps:
- Remove the pump and check the pipework in to the liner for any blockages. You should be able to see all the way to the debris screen.
- The debris screen can be cleared with a toothbrush or toothpick. On the newer Lay-Z-Spa hot tubs you are able to remove the top debris screen for cleaning.
Step 4 - The pump unit might need cleaning
To clear the pump and the pipework internally, you need to complete the backwash procedure:
How to backwash a built-in UltraFit pump

- Turn off and unplug the pump
- Empty the water
- Remove the filter housing and ChemConnect
- Unscrew and remove the two debris screens using the UltraFit Wrench tool
- Insert a hosepipe into one of the outlets and flush clean water through the pump circuit until it exits from the other passage. Do this for 2-3 minutes
- Then reverse the direction and flush back the other way
- Clean any debris or scale from the removable debris screens before refitting them
- Drain the flushed water from the hot tub liner, making sure no dirt or debris remains before a refill
How to backwash an external Lay-Z-Spa pump
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- Turn off and unplug the pump
- Remove ChemConnect and filter housing
- Attach the black stopper caps over the debris screens.
- Disconnect the pump: Unscrew the pipe connections
- Insert a hosepipe into one of the small outlets and flush clean water through the pump circuit until it exits from the other passage. Do this for 2-3 minutes
- Then reverse the direction and flush back the other way in the other small outlet
If the steps provided above, do not resolve the issue please contact our Customer Care team below.
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