All your Hot Tub Bromine Questions

So for some, this is a preferable sanitizer. However, as with any chemical sanitation system, bromine has its disadvantages. In small quantities dissolved into hot tub water, bromine is not too harmful, but it is naturally irritant to the human eyes and throat, so it’s best to avoid these areas and make sure you don’t swallow any hot tub water! 


Its a very clear NO with regards to mixing the two sanitisers, when managing your hot tub water you need to use either or and not both together.  Bromine Granules and Bromine Tablets are fine to use together and similarly Chlorine Granules with Chlorine Tablets.  Please do not mix the two sanitizers.

Bromine on the other hand works by forcing apart the chemical bonds of the contaminants in your hot tub water and as it dissolves in the water it remains active, continuing to work even when it has combined with the unwanted particles.

Unsurprisingly (and like its cousin chlorine), bromine also produces a waste product which is known as bromamine. However, bromamine is not known to have as many side effects when present in your hot tub, but it will reduce the efficiency of your bromine sanitiser. If you are using bromine in your hot tub as your sanitiser of choice, you will want to test the chemical levels regularly and undertake an oxy-shock treatment if the levels need adjusting.

Its a great question and one that cant specifically be answered due to not knowing bather loads and average weekly usage.  However as a rule of thumb you can start with one tablet in a floating dispenser with the lowest setting open and build it up from there whilst doing daily testing to see where your levels are at.

Once you get to a happy medium on the ideal range on your test strips then your there, the only factor to remember is when you use your tub the Bromine levels will naturally drop so this is where your Bromine Granules can come into use to aid your Bromine Levels..

Remember always add small amounts, as its easier to build up, but a challenge to get back down if levels are to high.

SpaChem Bromine tablets for hot tubs are designed to be dosed via a specific floating dispenser or an erosion feeder device which are also slow dissolving and ideal for daily dosing, this allows it to produce free active bromine which kills bacteria and other potentially harmful organisms..


The joys of having a bromine tablet dispenser, feeder or floating dispenser gives you the peace of mind knowing that you’ll have a continual dose of bromine being dispensed into your tub 24/7.   Ps as long as there's tablets in the of course :-)

In general, Bromine products are more expensive than Chlorine products. For example, here at SpaChem™, our chlorine products are around 20% cheaper than our bromine equivalents. This is normally due to the higher cost needed to purchase bromine. However, this can be offset by the fact that less bromine is required to get the same sanitizing power as chlorine. 

To give you more insight into bromine check out our blogs: Bromine the alternative to Chlorine & Chlorine vs Bromine

Are you finding as time goes on your spa smells? Looking forward to a nice relaxing soak in your hot tub but when you open up your spa cover you get this unpleasant odor? But the temptation of getting into what looks like a nice clean hot tub may have underlying issues. 

A hot tub that smells like rotten eggs is a sure sign that bacteria is hiding somewhere in your spa, spa parts, Jets, headrests, and spa cover, maintaining poor levels or low levels of bromine in your spa hot tub will result in high bacteria growth.  To ensure a consistent presence and dosing of bromine in your water it is recommended using a tablet dispenser for Bromine Tablets. 


Spa Bromine Granules 1kg, VK-HFP1-DN79

Our Spa Bromine Granules (1kg) are rapid dissolving and specifically blended to disinfect spa and hot tub water. 


  • Bromine granules are great for topping up Bromine levels to maintain sanitisation in your hot tub or spa, Our Bromine hot tub chemicals can be used in conjunction with Bromine Tablets to aid a consistent level of total bromine.
  • As noted our Bromine formulation is rapid dissolving and fast acting to increase your total bromine reading to the ideal range of 4 – 6ppm or parts per million.
  • In our specifications tab on this product we have listed a guidance on instructions, precautions and a warning, it goes without saying you must ensure you test the water with test strips before application and after any chemicals to ensure the actions you have taken have had the desired effect in achieving the correct ideal ranges needed. 
  • Part and parcel of managing your bromine levels is ensuring your water pH level and Total Alkalinity levels are also balanced.
  • Please also allow at least 20 minutes before entering the tub after chemically treating it and of course no one should be in the hot tub when dosing.
  • To all hot tub owners, hot tub care is a very important function when managing your water and to be effective in killing bacteria you must have consistent sanitisation levels in your spa at all times.
  • If you need to complete a bromine shock treatment in your hot tub an initial dose of 50mg which needs to be circulated for at least an 1 hour can be applied, but must be tested before entering to ensure Bromine levels have returned to within range, if too high run for a further 1 hour and recheck.  

Below is an average dosing guide:


Daily Dose Rates
Water volumesTo increase the bromine level by
LitresGallons1ppm3ppm6ppm
1,1002203g7g14g
1,6003304g10g20g
How to use
Instructions 1. Maintain the pH balance between 7.4 – 7.6 2. On START UP and COMISSIONING of new water, use this product to Shock Dose the water to a minimum of 20 PPM with circulation / blowers on and all covers off. 3. Test the water with a BROMINE test kit, the ideal reading for Total Bromine is 4 – 6ppm 4. To increase the Total Bromine reading of the Spa or Hot Tub water by 1ppm add 3g of Spa Brominate Granules per 1000lts of water 5. Spa Brominate Granules can be added directly to the water with circulation running and water temperature above 20°C. 6. If using this product to “Shock Dose” the water please wait a minimum of 40 minutes before bathing re-starts. 7. If you experience difficulties please contact your local dealer
Precautions • Always ensure bathers are out of the water when adding chemicals. • Never mix with any other chemicals including cleaning products, weed killers and chlorine products, as a dangerous reaction may occur. • Always handle products in a well-ventilated area. • Always wash hands thoroughly after handling chemicals. • Store in a cool, dry, well ventilated, secure place. Ensure chemicals do not become damp in storage. • Instructions and dosages given are a guide to most effective use.
Warning • This container must not be used or contaminated with any other materials.

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Spa Bromine Granules - Bromine Infused Granules 1kg

  • Brand: SpaChem
  • Product Code: SpaChem
  • Availability: 44
  • • : Ideal pack sizes 1kg & 5kg
  • • : Relatively pH Neutral vs other santizers
  • • : Ideal range of 4 – 6 parts per million
  • • : Rapid dissolving and fast acting
  • • : 1kg Bromine Infused Granules
  • £19.12
  • £16.12

  • Ex Tax: £13.43

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Tags: Bromine Granules, Hot Tub Bromine Granules, Bromine

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