Aquablanc is a gentle, odour-less alternative to the traditional hot tub water sanitisers. The Aquablanc system systems comprise two components: tablets and a liquid, which work synergistically together. The tablets must be added with each hot tub use, or weekly if the tub isn't used, to destroy bacteria and remove organic impurities. The liquid is a long lasting activator and algae preventer.

Aquablanc very closely replicates the effect that you achieve by using chlorine, with less likelihood of skin irritation and with no unpleasant smell or bleaching.


5 Item(s)

  1. Aquablanc O2 Tablets - 1kg from HotTubsUK

    These are the sanitizer tablets for use with Aquablanc non-chlorine active oxygen system.

    These O2 tablets destroy bacteria and remove organic impurities. They must be used in conjunction with Aquablanc Spa A Combination Liquid and should be applied to the water using a floating dispenser.

  2. Aquablanc A Combination Liquid - 1lt from HotTubsUK

    Weekly activator liquid and algaecide for use only with the Aquablanc O2 tablets.

    Apply directly to the water every seven days with the pumps running.

  3. Blue Horizons Active Oxygen Test Strips from HotTubsUK

    50 Active Oxygen test strips.

    You should test your spa an hour after application of each Active Oxygen tablet and prior to entering the water to ensure that the Active Oxygen level is in the range 5.0 - 10.0 ppm.

    Simply dip a strip into the spa water and compare with the colour chart.

    These strips test for Active Oxygen, pH and Total Alkalinity

  4. Aquablanc Starter Kit from HotTubsUK

    All you need to sanitize your spa with Active Oxygen.

    Ideal for Inflatable Spas.

  5. Aquablanc 02 gentle swimspa water treatment

    Aquablanc O2 Gentle is a new, chlorine free Active Oxygen based water treatment system for maintaining crystal clear & bacteria free water in swim spas and small pools. It is a a gentle and much easier to use alternative to traditional chlorine or bromine water treatment systems..

    Contains 12 weekly treatments.

5 Item(s)


What is Active Oxygen?

Active Oxygen sanitation is based on the use of potassium monopersulphate tablets.  Potassium monopersulphate works in much the same way as chlorine or bromine in that it kills bacteria and breaks down bather waste. However, unlike chlorine or bromine, monopersulphates don't produce by-products that irritate the skin or eyes and cause nasty smells.

Active Oxygen (O2) tablets are used in conjunction with a weekly does of a liquid activator  which also acts as an algaecide.

How often should I add the liquid?


How often should I add the tablets?

Before you use your hot tub or weekly if it is not used.

When should I test the Active Oxygen level?

Always test one hour after application of the O2 tablets. The reading should be 5 - 10 ppm one hour after application.

What TA and pH levels should I maintain

When using O2 as a sanitizer you shoukld maintain the following water balance:

  • TA 80 - 160 ppm
  • pH 7.0 - 7.4
  • Total Hardness 250 - 500 ppm

Do I still need to use a shock treatment?

Yes. A shock is necessary with any hot tub water treatment system because there is no other way of removing dissolved organic contaminants, such as perspiration, body oil or make-up, from the water. You should shock weekly or fortnightly, depending on your hot tub use.

You can shock the water with a double dose of O2 tablets if you wish, but use of a chlorine-based powdered shock, such as Spa Shock Express, will be more effective and so will extend the period between water changes.

How important are the filters?

Filtration is a vital part of keeping your spa water crystal clear. In common with any sanitising system, you should make certain that your filtering cycle is adequate for your spa volume and usage. Clean your filters regularly using a proprietary filter cleaner and replace them every 6 - 12 months.

Filters last longer if they are allowed to dry out properly between uses so it's a good idea to keep a spare set and rotate them.