Oxygen Hot Tub Maintenance Guide & Schedule

Many people don’t know that you can use active oxygen as an alternative sanitiser for their hot tub water. Oxygen is a much milder solution to chlorine and bromine, so it is recommended for bathers with sensitive skin.

Oxygen sanitiser is a combination of tablets and liquid. Both must be used for it to work.

Daily Hot Tub Use:

An oxygen level of between 5-10mg/l must be maintained in your hot tub at all times. Prior to bathing add one 20g tablet per 1,500 litres of spa water (one 20g tablet per day should be sufficient for normal daily spa use). 
Note: 10ml = approximately 10g

Weekly Hot Tub Maintenance:

When performing the weekly maintenance, it is important to ensure the pumps are running and the hot tub is uncovered.

  1. Clean the filters with a hose pipe to remove any debris build up and leave to dry afterwards. You can use a filter cleaner spray to prevent a build-up of grease and we recommend purchasing a spare filter, allowing you to rotate them on a weekly basis
  1. Add 1x 20g Oxygen Tablet per 1500 litres
  1. Add 15ml of Oxygen Liquid per 1500 litres
  1. Use test strips to ensure the pH level is between 7.0 & 7.4. If the pH level is outside of this range, then add either pH Increaser (pH+) or pH Decreaser (pH-) to balance
  1. Check the oxygen level is 5mg/l or more, if low add another oxygen tablet
  1. Add 35g of chlorine shock (per 1500 litres) and leave spa uncovered with jets on for a minimum of 20 minutes
  1. Adding 23ml of no-scale per 1,500 litres of water in hard water areas will help prevent a build up of scale in your hot tub

Quarterly Hot tub Maintenance:

  1. Remove & soak the filters overnight in filter cleaner, rinse with hose pipe and leave to dry
  1. Fully drain hot tub and fill with fresh water
  1. Balance pH by following step 4 in the weekly maintenance schedule, ensuring it is between 7.0 and 7.4
  1. To sanitise the fresh water add 2 x 20g oxygen tablets and per 60ml of oxygen liquid per 1500 litres of water.
  1. Adding no-scale 38ml per 1,500 litres of water in hard water areas will help prevent a build-up of scale in your hot tub.

 Extra Tips:

  1. Cloudy water caused by small particles (like soap) that are passing through the filter can be cleared with spa clearand foaming can be corrected with no-foam
  1. Your water clarity can be further improved by removing minerals and salts when filling with a pre-filter which connects onto your hose

Our Oxygen Maintenance Guide is a quick reference for your convenience. Please consult your chemical guide, the instructions on the product or call us if you require further information. Note the quantities shown are based on a spa water volume of 1500 litres so adjust accordingly. The guide also recommends the use of No Scale however this is only needed in hard water areas.

Additional Guides:

For more help and advice on some of the points above, we have a series of guides available: