Oxygen Hot Tub Maintenance Guide & Schedule

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.


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 = approx 10g

Weekly Hot tub Maintenance:

1. Remove filters and rinse with a hose pipe then leave to dry. (You can purchase a Filter Cleaner Spray to prevent any build up of grease)
2. (Tip) Purchasing a spare filter to rotate on a weekly basis is recommended
3. Switch on all pumps and open jets
4. Add 1x 20g Oxygen Tablet per 1500 litres
5. Add 15ml of Oxygen Liquid per 1500 litres
6. Check pH level is 7.0-7.4 and adjust if required with pH Increaser (pH+) or pH Reducer (pH-)
7. Check Oxygen level is 5mg/l or more, if low add 1 more Oxygen Tablet
8. Add 35g of Chlorine Shock (per 1500 litres) and leave spa uncovered with jets on for a minimum of 20 minutes
9. Add 23ml of No Scale (per 1500 litres) to help prevent scale build up

Quarterly Hot tub Maintenance:

1. Soak filters overnight in Filter Cleaner, rinse with hose pipe and leave to dry
2. Drain hot tub and fill with fresh water
3. Balance pH as above in step 7
4. To sanitise the fresh water:
Add 2 x 20g Oxygen Tablets per 1500 litres.
Add 60ml of Oxygen Liquid per 1500 litres.
Add 38ml of No Scale


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