Chlorine Mini Tablets

Slow-release stabilised chlorine for hot tubs and small pools. A 20 g trichlor (TCCA) tablet that holds 3-5 ppm free chlorine for up to a week per dose with cyanuric acid stabilisation.

• Holds free chlorine at 3-5 ppm for up to 7 days.
• Stabilises against UV burn-off with built-in cyanuric acid.
• Dissolves slowly through a floating dispenser or erosion feeder.
• Compatible with cartridge filters and circulation pumps.
• Designed for tubs and pools without an automatic chlorinator.

Sizes and prices

• 1kg: £14.48
• 2.5kg: £24.11
• 5kg: £40.17
• 10kg: £72.28
• 20kg: £136.49
• 25kg: £168.60

When you need it

• You manage your own water and want a low-effort sanitiser.
• Free chlorine has dropped below 1 ppm.
• It is time for a weekly top-up.
• Bather load has been higher than usual.
• Sun exposure is high and unstabilised chlorine burns off too quickly.

How to use

1. Test free chlorine, pH and total alkalinity with a fresh kit.
2. Confirm pH 7.2-7.6 and alkalinity 80-120 ppm before dosing.
3. Place 1 tablet per 4500 L into a floating dispenser or erosion feeder.
4. Adjust the dispenser to release evenly over 7 days.
5. Test free chlorine after 24 hours; aim for 3-5 ppm.
6. Add or remove a tablet to maintain the target band.

Dosing guide

Standard maintenance dose. Heavy bather load or hot weather can lift demand to 1.5 tablets per 4500 L per week.

• For 1,500 L hot tub, add 1 tablet (20 g) to reach Weekly maintenance.
• For 4,500 L large hot tub, add 1 tablet (20 g) to reach Weekly maintenance.
• For 10,000 L small pool, add 2 tablets to reach Weekly maintenance.
• For 20,000 L mid pool, add 4-5 tablets to reach Weekly maintenance.
• For 50,000 L large pool, add 11-12 tablets to reach Weekly maintenance.

How it works

Trichloroisocyanuric acid (TCCA) compressed into 20 g slow-release tablets. Each tablet contains approximately 90% available chlorine and built-in cyanuric acid stabilisation.

TCCA dissolves to release hypochlorous acid (the active sanitiser) and cyanuric acid (the stabiliser). The cyanuric acid binds reversibly to free chlorine and shields it from UV destruction, holding sanitiser through the day.

Unstabilised chlorine is destroyed within 2 hours of full sunlight. Stabilised TCCA tablets hold a full week of sanitisation in outdoor tubs and pools, slashing manual dosing and chlorine consumption.

Frequently asked questions

What is the ideal free chlorine level?

3-5 ppm for hot tubs and 1-3 ppm for outdoor pools.

How long does one tablet last?

Up to 7 days in a 4500 L tub at standard temperature and bather load.

Do I need a separate stabiliser?

No. TCCA tablets are pre-stabilised with cyanuric acid.

How long does a 1 kg pack last?

50 tablets at 20 g each, about a year for a single 1500 L hot tub.

Can I use them in an inflatable hot tub?

Yes, in a floating dispenser. Never drop tablets onto the vinyl shell.

Are they safe for salt-water systems?

Use only when the salt cell is offline; tablets are normally redundant in salt systems.

What is the active ingredient?

Trichloroisocyanuric acid (TCCA) at approximately 90% available chlorine.

What is cyanuric acid?

A UV stabiliser that protects free chlorine from sun degradation. Required for outdoor use, undesirable indoors.

Can I use them indoors?

Yes, but switch to unstabilised chlorine if you do not need UV protection. Indoor CYA build-up wastes chlorine.

Chlorine drops too fast?

Increase tablet count or shock with a non-stabilised oxidiser; check filter is clean.

Strong chlorine smell?

Combined chlorine high; shock with MPS and ventilate for 30 minutes.

pH drifting low?

TCCA is acidic; dose pH plus weekly to compensate.

TCCA tablets vs SDIC granules?

TCCA is slow-release and acidic; SDIC is fast-acting and pH-neutral. Tablets for ongoing dosing, granules for top-ups and shocks.

TCCA tablets vs bromine tablets?

TCCA is stabilised chlorine for outdoor use. Bromine is more stable at hot tub temperatures and gentler on bather skin.