Chlorine Mini Tablets

A hands-off way to chlorinate hot tubs and smaller pools. Drop one 20 g trichlor (TCCA) tablet into a feeder and it trickles out enough chlorine to sit in the 3-5 ppm band for as long as a week, with cyanuric acid already blended in so the sun cannot burn it off.

• Trickles chlorine out steadily so a single dose lasts up to 7 days at 3-5 ppm.
• Carries its own cyanuric acid, so daylight does not strip the sanitiser away.
• Erodes slowly inside a floating dispenser or an in-line feeder rather than dumping all at once.
• Sits happily alongside cartridge filtration and a standard circulation pump.
• Suits owners whose tub or pool has no automatic dosing system to lean on.

Sizes and prices

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

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

How to use

1. Start with a fresh test of free chlorine, pH and total alkalinity.
2. Get pH sitting between 7.2 and 7.6 and alkalinity between 80 and 120 ppm before you add anything.
3. Drop one tablet for every 4500 L of water into a floating dispenser or an in-line erosion feeder.
4. Adjust the feeder so the tablet gives up its chlorine evenly across the 7 days.
5. Come back after 24 hours and test again; you are looking for 3-5 ppm.
6. Nudge the tablet count up or down until the reading settles in that band.

Frequently asked questions

What free chlorine level should I aim for?

Keep hot tubs at 3-5 ppm and outdoor pools at 1-3 ppm.

How long does one tablet last?

In a 4500 L tub at a normal temperature and bather load, reckon on roughly 7 days.

Do I need a separate stabiliser?

No, the cyanuric acid is already inside every TCCA tablet.

How long does a 1 kg pack last?

There are 50 tablets at 20 g apiece, which is about a year for one 1500 L hot tub.

Can I use them in an inflatable hot tub?

Yes, as long as they go in a floating dispenser; do not let them touch the vinyl shell.

Are they safe for salt-water systems?

Only run them while the salt cell is switched off; a working salt system usually makes them unnecessary.

What is the active ingredient?

Trichloroisocyanuric acid (TCCA), running at around 90% available chlorine.

What is cyanuric acid?

It is a UV shield for free chlorine: valuable outdoors where the sun is a problem, but a nuisance indoors where it is not.

Can I use them indoors?

You can, but with no sun to guard against, unstabilised chlorine is smarter; indoor CYA just keeps climbing and wastes chlorine.

Chlorine dropping too fast?

Put another tablet in or shock with a non-stabilised oxidiser, and make sure the filter is not dirty.

Strong chlorine smell?

That is high combined chlorine; shock with MPS and let the spa air for 30 minutes.

pH drifting low?

Because TCCA is acidic, top up with pH plus each week to offset it.

TCCA tablets or SDIC granules?

Tablets erode slowly and lean acidic; SDIC granules act fast and stay pH-neutral. Reach for tablets for steady dosing and granules for top-ups and shocks.

TCCA tablets or bromine tablets?

TCCA is stabilised chlorine that shines outdoors; bromine copes better with hot-tub heat and is kinder to the skin.