Should I use chlorine or bromine in my hot tub?

Bromine works better at hot tub temperatures and across a wider pH range, while chlorine is faster acting. Both are safe and effective when dosed correctly.

What free chlorine level should a hot tub hold?

3 to 5 ppm free chlorine, with combined chlorine below 1 ppm. Bromine equivalents are 4 to 6 ppm.

Can I switch from chlorine to bromine?

Yes, but only after a fresh fill. Mixing the two during a single fill produces unpredictable readings.

How long after dosing chlorine can I get in?

Wait until free chlorine drops below 5 ppm. With a small top-up dose this is typically 20 to 30 minutes with the pump running.

Why does my hot tub smell of chlorine?

A strong chlorine smell signals high combined chlorine, not high free chlorine. Shock the water with a non-chlorine oxidiser to break it down.

Hot Tub Water Sanitisers

Sanitiser is the single product keeping your hot tub safe to use. ClearSpa carries the four sanitiser families used by UK spa owners and small commercial sites: stabilised chlorine, bromine, BCDMH and chlorine dioxide.

Products in this range

Chlorine Mini Tablets: £14.48 to £168.60
Hot Tub Bromine Granules BDCMH: £16.18 to £210.60
Hot Tub Bromine Tablets 20g - Slow Dissolving: £18.47 to £263.62
Stabilised Chlorine Granules SDIC: £9.95 to £132.71