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How to use chlorine in your hot tub

How to use chlorine in your hot tub - Click to enlarge

There are several disinfection methods by chemical treatment: chlorine, bromine and active oxygen. Among these three methods, chlorine has the advantage of being persistent (it remains active for several days in a clean spa), inexpensive, of acting immediately and finally of being very effective, even at very low concentrations.

Are you treating your spa with bromine or do you want to treat your spa with bromine? Here is some information that may help you.

After draining or restarting the spa

If you change the water or if your spa has been off for a while, it is possible that biofilm has developed in the piping. It is therefore necessary to start with a cleaning using the Spa System Flush or the Ahh Some. The instructions for use of these products are given on the corresponding pages.

Feel free to follow the tips from our team to prevent biofilm from appearing in your spa !

Regular treatment

Now that everything is in order we can start. Once the spa is filled with water, here are the steps to follow:

  • Start by adding non-Chlorine Shock, at a rate of 15g per cubic meter of water. The latter will eliminate the bacteria present in the water.
  • Then add the chlorine in granules or effervescent tablets directly to the spa or diluted in a bucket of water beforehand. For quantities, allow 15 g per cubic metre of water for granules or 3 effervescent tablets per cubic metre of water.
Ideally, you should check your free chlorine level every day, just before swimming. This rate must be between 1 and 3 ppm (the conversion from ppm to mg/l is simple: 1 ppm = 1 mg/l).
Two measurement methods are possible: with Aquacheck or InstaTest test strips (fast but imprecise method) or with an analysis kit containing DPD1 tablets, which allows more rigorous measurements.
One teaspoon of HTH granulated chlorine in a clean 1000-litre spa will increase the rate by 2 ppm.
If chlorine level is 0: the water is no longer disinfectant and bacteria have started to proliferate. If the level has been at 0 for only a few hours, you can "catch up" with your water by adding a shock product, such as active oxygen. If the rate has been at 0 for several days, the situation is more serious because there is biofilm.

"Shock" your water regularly

The use of shock is important, as bromine will act against bacteria each time the spa is used. But it will gradually become saturated (Free bromine will be less and less present, and there will be more and more combined bromine instead). We will therefore "release" it again by shocking the water with the chlorine-free shock.

Check the pH value

Chlorine is very sensitive to the pH of your water, you still need to adjust it ideally to ensure good treatment stability. As a reminder, a good pH is between 7.0 and 7.6.

  • If the pH is too low you will have to use pH plus
  • If the pH is too high you will have to use pH minus

If you notice that the TAC (total alkalinity) of the spa is too low, add a little pH stabilizer.

You can also find the main products needed for processing in the form of boxes.

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