Should I use chlorine or bromine in my hot tub?

Bromine handles hot tub heat better and stays effective across a wider pH range; chlorine acts more quickly. Dosed properly, either one is safe and does the job.

What free chlorine level should a hot tub hold?

Aim for 3 to 5 ppm free chlorine with combined chlorine kept under 1 ppm. On bromine, the equivalent target is 4 to 6 ppm.

Can I switch from chlorine to bromine?

You can, but wait for a fresh fill to do it. Run the two together in the same water and the readings become impossible to trust.

How long after dosing chlorine can I get in?

Hold on until free chlorine falls below 5 ppm. After a small top-up with the pump running, that's usually 20 to 30 minutes.

Why does my hot tub smell of chlorine?

That sharp smell means combined chlorine is high, not free chlorine. A non-chlorine oxidiser shock breaks it apart and clears the odour.

Spa Pool Water Sanitisers

If one product keeps your hot tub fit to use, it's the sanitiser. Zagosa Spa & Pool stocks all four families that UK spa owners and small commercial sites rely on: stabilised chlorine, bromine, BCDMH and chlorine dioxide.