Pool Chlorine Tablets 200g - Slow Dissolving

Slow-dissolving 200g stabilised chlorine tablets for hands-off swimming pool sanitising. Loaded into a feeder or floating dispenser, each tablet erodes over roughly a week, holding a steady free chlorine level with sunlight protection built in.

• Feeds free chlorine steadily over 5-7 days per tablet.
• Carries built-in cyanuric acid stabiliser, so sunlight burns off far less chlorine.
• Holds sanitiser cover between visits with no daily dosing.
• Delivers roughly 90% available chlorine, the strongest tablet format.
• Suits inline and offline feeders, skimmer baskets on continuous-run plant, and floating dispensers.

Sizes and prices

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

• 5kg: £39.00
• 10kg: £78.00
• 20kg: £156.00
• 25kg: £195.00

How to use

1. Test free chlorine, pH, alkalinity and cyanuric acid before starting.
2. Balance pH to 7.2-7.6 first; tablets work poorly in unbalanced water.
3. Load tablets into an inline or offline feeder, or a floating dispenser sized for 200g tablets.
4. Set the feeder or dispenser opening to hold 1-3 ppm free chlorine.
5. Run the circulation pump daily so the feed disperses evenly.
6. Test twice a week and adjust the tablet count or flow setting, not the pH of your habits.

Frequently asked questions

How long does one 200g tablet last?

Typically 5-7 days in a feeder, faster in hot weather or fast-flowing feeders.

What free chlorine level should I hold?

1-3 ppm for domestic pools, tested at least twice a week in summer.

Can I swim with the dispenser in the pool?

Yes, provided free chlorine reads inside 1-3 ppm. Remove the dispenser only if children might tamper with it.

Do I still need to shock the pool?

Yes. Tablets hold the everyday level; a weekly or fortnightly shock clears combined chlorine that tablets cannot.

Which tub size should I buy?

5 kg (25 tablets) covers a small pool's season; 10 kg and 20 kg suit family pools; the 25 kg tub is the trade and club buy.

Are these the same as multifunctional tablets?

No. These are pure sanitiser at maximum strength. Multifunctional tablets trade some chlorine content for built-in clarifier and algae inhibitor.

Will they fit my dispenser?

They are standard 200g pool tablets, the size all large floating dispensers and feeders are designed around. Spa dispensers for 20g tablets are too small.

Are these tablets stabilised?

Yes, TCCA carries its own cyanuric acid, which shields the chlorine from UV on outdoor pools.

Do they affect pH?

Yes, trichlor is acidic. Expect a slow downward pull on pH and alkalinity and correct it as routine.

How much stabiliser do they add?

Roughly 6 ppm of cyanuric acid for every 10 ppm of chlorine delivered. Keep CYA between 30 and 80 ppm with occasional partial refreshes.

Why is chlorine low with tablets in the feeder?

Demand has outrun the feed. Open the feeder or add a tablet, and shock once to re-establish the level.

Chlorine reads high but the water looks green, why?

Likely over-stabilisation. Test cyanuric acid; if it is over 80 ppm, part-refresh the water and shock.

Tablets or granules for a pool?

Tablets give a steady hands-off feed; granules give instant, controllable lifts. Most pools run tablets for baseline and granules for shocks.

TCCA tablets or multifunctional tablets?

Pick TCCA for maximum sanitiser per tablet and lowest cost per week. Pick multifunctional if you want clarifier and algae control folded into the same dose.