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Hot Tub & Spa Bromine Guide

Sanitise your spa water

The reason that sanitisers are used in spas is to ensure that the water is healthy by preventing and killing bacteria. This is achieved by continuously and consistently maintaining a level of sanitiser (disinfectant) in the water with either chlorine or bromine. For expert advice, please contact Penguin Hot Tubs directly on 0800 112 3886 or via email: where we will be more than happy to assist.


Bromine is similar to chlorine in its effectiveness as a sanitiser but there are some important differences that make it an ideal product for using in a spa:

  • Bromine tablets should be dosed into the spa via a floating dispenser.

  • Bromine, like chlorine, combines with organic compounds to form bromamines, but unlike chloramines, bromamines cause little or no eye, skin and nasal irritation. Also there is not the pungent smell sometimes associated with certain types of chloramines.

  • Bromine retains better levels of efficiency over a wider pH band than chlorine, see chart below, which makes it ideal for spas as the pH can fluctuate a fair amount.

Spa Bromine Granules

AquaSPArkle Spa Bromine Granules are a highly effective sanitiser formulated to kill and prevent bacteria and algae growth in a spa. Being a granular product it is easy to vary the dose rate to suit requirements. These granules have a fairly neutral pH so won’t upset the water balance.

Spa Bromine Tablets

AquaSPArkle Spa Bromine Tablets should be dosed via a floating dispenser. When set up correctly your floating dispenser will dispense the correct amount of bromine into the spa to maintain the ideal level between 3.0 to 5.0mg/l and all you need to do is top up with new tablets as and when required. This makes maintaining the sanitiser level in your spa very straightforward. When using a floating dispenser remember to remove it from the spa and place it on a non-bleachable surface while people are bathing.

Please note Spa Bromine Tablets are designed to maintain bromine levels (as they are slow dissolving), so before using them the correct bromine level should be established using Spa Bromine Granules.

Need further advice or assistance? Advice and troubleshooting information can be found here to help you enjoy your hot tub as long as possible or if you can’t find what you are looking for, please contact our hot tub experts directly on 0800 112 3886 or email


Hot Tub chemical safety

Below are some important tips when using Hot Tub chemicals:

  • Always read the label of any hot tub chemical before use and follow the instructions carefully

  • Never mix hot tub chemicals unless instructed to do so by a specialist

  • Always pre- dissolve any granules in a jug or container before adding them into your hot tub

  • Always add chemicals to water, never the other way around

  • Never add chemicals to your hot tub water while it is in use

  • Only use hot tub chemicals in well ventilated areas

  • Beware of strong winds when using powdered chemicals

  • Always keep all hot tub chemicals out of reach of children and animals

  • Make sure you wash your hands after using hot tub chemicals

  • Penguin Hot Tubs strongly advises wearing protective clothing whenever handling chemicals

  • Test your hot tub water daily (with either Bromine or Chlorine test strips)

  • Store hot tub chemicals away from heat and moisture

  • Always leave your hot tub switched on (unless changing the filter or the water)

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