How much will Filters and Chemicals cost each year?

The average cost for chemicals and filters should be around £250 per year. This will of course vary depending on your usage and bather load.

How do I deal with Air Locks?

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.

What should my chemical routine be?

It’s one of the main areas in owning a hot tub, looking after the water but by following these simple guidelines, maintaining crystal clear water should be a breeze:

  • It is recommended that your hot tub should be fully drained and refilled at least every 12 weeks. This can range between 8 to 12 weeks depending on use.
  • When refilling the spa, the hose should always be placed in the filter bucket. This will help prevent air locks at the pump wet ends.
  • Your spa water should be tested every two days. The readings you should be seeing are: Chlorine/Bromine 3-5ppm, PH between 7.2 and 7.6. Alkalinity between 80 and 120ppm.
  • Adjust the chemical levels accordingly after testing with your strips. If you are using chlorine or bromine tablets, these should be checked at least every 2 weeks to ensure there are enough tablets in the dispenser.
  • Should the PH level need adjusting up or down, weigh out 70 grams of adjust up or adjust down (depending on which way you have to adjust). Pre-mix this and add the solution to the spa water. Remember to run the pumps whenever adding any chemicals to allow them to circulate. After 20 minutes the pumps will shut off and you should then retest the PH level. If the PH is still too high/low, repeat the above until you have the level between 7.2 and 7.6 again.
  • You should always remove your spa pillows when the spa is not in use. This will prolong their life. Also, the manufacturer doesn’t cover pillow deterioration if they are left in the spa when it’s not in use.
  • Your disposable filter should be changed every 3 to 4 months depending on use.
  • The spa water level should be kept just above the highest jets. This will help prevent air being drawn in through the filter and causing an air lock at the pump.

Which Filters are better? Paper or Disposable?

It always comes down to customer preference, but from a filtering point of view the silver sentinel is far better as a filter.

Silver Sentinel Pros

  • Filters particles down to 1 micron.
  • No need to wash it out every week.
  • Fit and forget filter.
  • No need to use a clarifier chemical.


Pleated Pros

  • It is washable.
  • Lasts up to 12 months if taken care of correctly.
  • Perfect for collecting larger particles such as hair.