Hot Tub Bromine Tablets 20g - Slow Dissolving

Slow-dissolving 20 g bromine tablets for hot tubs and spas. Sat in a floating dispenser they hold 4-6 ppm total bromine for 1-2 weeks per dose, which makes them ideal for low-effort weekly care.

• Holds total bromine at 4-6 ppm for 1-2 weeks per dose.
• Dissolves slowly through a floating dispenser or erosion feeder.
• Stays active across pH 7.0-7.8 and temperatures up to 40 C.
• Produces fewer skin-irritant by-products than chlorine.
• Pairs with Bromine Granules when you need a fast top-up.

Sizes and prices

Available in 1kg, 2.5kg, 5kg, 10kg, 20kg, 25kg.

• 1kg: £18.47
• 2.5kg: £33.79
• 5kg: £59.33
• 10kg: £110.40
• 20kg: £212.55
• 25kg: £263.62

How to use

1. Make sure the hot tub is clean and filled with fresh water.
2. Test pH and alkalinity; balance to pH 7.2-7.6 and TA 80-120 ppm.
3. Load 1-3 tablets per 1000 L into a floating dispenser or erosion feeder.
4. Set the dispenser ports to release evenly over 7-14 days.
5. Test bromine after 24 hours; aim for 4-6 ppm total bromine.
6. Add or remove tablets to hold the band; shock weekly with MPS.

Frequently asked questions

How long do the tablets last in a dispenser?

Depending on flow rate and water temperature, they usually last 1-2 weeks before they need topping up.

Can I use them in my inflatable hot tub?

Yes. Used in a floating dispenser they are perfectly safe and effective in inflatable hot tubs.

How many tablets does my tub need?

As a rough guide, use 1-3 tablets per 1000 litres and adjust from regular testing to hold 3-5 ppm.

How long does a 1 kg pack last?

50 tablets at 20 g each, around 4-6 months for a typical 1500 L hot tub.

Are they suitable for sensitive skin?

Yes. Bromine forms fewer skin-irritant by-products than chlorine and is the usual choice for sensitive bathers.

Will they work in a salt-water spa?

Use them only when the salt cell is offline; bromine and salt chlorination are not run at the same time.

What is the active ingredient?

Bromochlorodimethylhydantoin (BCDMH) at >= 60% available halogen.

Why is bromine better at high temperature?

Bromine stays stable above 38 C while chlorine is quickly destroyed. Hot tubs need a sanitiser that survives the heat.

Do I still need to shock?

Yes, weekly with Non-Chlorine Shock to clear combined bromine and rebuild the active bromine bank.

Bromine reading low?

Open the dispenser and dose Bromine Granules to refresh the bank.

Strong bromine smell?

Shock with MPS and ventilate for 30 minutes.

Tablets vanishing too fast?

Close the dispenser ports; check the water temperature is within range.

Bromine tablets or chlorine tablets?

Bromine copes with heat better and is gentler on skin; chlorine is cheaper but burns off faster at hot tub temperatures.

Bromine tablets or bromine granules?

Tablets give a slow steady release for low-effort care; granules give fast top-ups when bromine has dropped.