Oxygen Hot Tub Maintenance Guide & Schedule
Pair a tablet before each soak with a weekly liquid, and bathe at 5 to 10 mg/l
Active oxygen is a mild, odour-free alternative to chlorine and bromine. This guide gives you the routine: what to add, when to test and when to bathe.
Test before you bathe, every time.
Your oxygen routine
Active oxygen is an alternative to chlorine or bromine as your regular sanitiser. It uses two products together: a tablet before each soak and a liquid once a week.12
| Task | What to aim for | How often |
|---|---|---|
| Oxygen tablet | One 20 g tablet per 1,500 litres, in a floating dispenser1 | Before each soak1 |
| Oxygen liquid | 15 ml per 1,500 litres, with a tablet2 | Weekly2 |
| Active oxygen level | 5 to 10 mg/l before bathing1 | Test daily, and before you bathe23 |
| pH | 7.0 to 7.84 | With each oxygen test |
| Drain and refill | Clean, fresh water | About every two months5 |
Our sanitiser guide compares oxygen with the other sanitisers, and our pH guide covers the pH step.
How much to add
Use one 20 g tablet for every 1,500 litres of water. Once a week, add 15 ml of liquid per 1,500 litres along with a tablet.12
As a guide, 10 ml weighs about 10 g.2
| Water volume | Tablets | Weekly liquid |
|---|---|---|
| 1,500 litres | 1 | 15 ml |
| 3,000 litres | 2 | 30 ml |
| 4,500 litres | 3 | 45 ml |
These doses scale the label rate of one tablet and 15 ml per 1,500 litres.
Before each soak, step by step
Start the filtration
With the spa filtration running, place one 20 g tablet per 1,500 litres in a floating dispenser.1
Wait at least one hour
Give the tablet time to work before you test.1
Test the water
Use strips suitable for active oxygen. See the oxygen strips.13
Bathe at 5 to 10 mg/l
Get in when the active-oxygen result is between 5 and 10 mg/l and your other readings meet the instructions.1
The weekly treatment
What to add
Once a week, pour 15 ml of oxygen liquid per 1,500 litres directly into the tub, along with one 20 g tablet per 1,500 litres.2
Keep testing
Test the water daily with oxygen test strips, which read active oxygen, pH and total alkalinity.23
Our cloudy, foamy or green water guide covers what to do if the water changes.
What the readings tell you
Reading is 5 to 10 mg/l
The water is ready for bathing, as long as your other readings meet the instructions.1
Reading is below 5 mg/l
Check the filtration is running and you have waited at least one hour, then test again.1
Total alkalinity
The oxygen strips read total alkalinity too, so you can check it in the same dip.3
Drain and refill every couple of months
Drain, clean and refill about every two months. Adjust that for the size of your tub, your manufacturer's instructions and how often you use it.5
Your oxygen kit
The products for the routine above, plus pH minus for balancing. Every one is new and in stock now.
Jacuzzi Hot Tub Oxygen Tablets
1 kg · £19.99
Before each soak. 20 g tablets for measured dosing, one per 1,500 litres.
1 L · £17.99
Every week. Works alongside the tablets to sanitise the water.
Jacuzzi Hot Tub Oxygen Water Test Strips
Pack of 50 · £11.49
Every day. Reads active oxygen, pH and total alkalinity.
Quick answers
Open a question to read the answer.
What active oxygen level should my hot tub have?
Between 5 and 10 mg/l, which is the same as 5 to 10 ppm. Our Jacuzzi oxygen pages say to bathe only when the active-oxygen result is in that range.
Can I use oxygen tablets without the liquid?
No. Jacuzzi oxygen tablets are designed to be used alongside Jacuzzi oxygen liquid. Follow both product labels for the complete routine.
How long should I wait after adding an oxygen tablet?
At least one hour. Then test with strips suitable for active oxygen before you bathe.
How often should I add the oxygen liquid?
Weekly. Add one 20 g tablet and 15 ml of liquid per 1,500 litres, and test your water daily.
Is oxygen a good choice for sensitive skin?
Our oxygen product pages describe it as a mild, typically odour-free alternative to chlorine and bromine that suits people with sensitive skin.
Sources
- Jacuzzi, Hot Tub Oxygen Tablets product page, sold by Outdoor Living: dose, wait time and bathing range (current)
- Jacuzzi, Hot Tub Oxygen Liquid product page, sold by Outdoor Living: weekly dose and level (current)
- Jacuzzi, Hot Tub Oxygen Water Test Strips product page, sold by Outdoor Living: what the strips read (current)
- Centers for Disease Control and Prevention, Home pool and hot tub water treatment and testing (page updated 10 May 2024): pH range
- King County, Washington, Department of Public Health, Staying Happy and Healthy in Your Spa and Hot Tub, sixth edition (undated): draining, cleaning and chemical handling
Paul Margerison
Managing Director & Founder, Outdoor Living
Oxygen is a pair: a tablet before each soak, a liquid every week, and a test before you bathe.