How many tablets are required in a hot tub? How many needed per litre/gallon?

Due to set ups and water conditions being different there is no definitive rule,.. The best way is to "balance" your hot tub water first, so you have the optimal levels before using chlorine tablets. Then add 2 or 3 tablets in a floating dispenser which should dissolve slowly over a number of days, monitor the chlorine levels with a test kit and adjust the flow of the dispenser until you have a constant desired chlorine level. Once you have the desired flow it's as simple as checking and replacing the tablets every 4-5 days.

Wil these fit into the little grey floater we got with our Intex 4 seater spa?

These are 1 inch tablets and should fit most floating dispensers...

How many tablets are recommended for a 12ft pool please and how much should the dispenser be open? Thanks

I had an 8ft pool and used 1 tablet with the dispenser open under half way. It took quite a while to dissolve and I found that if the chlorine was too strong, I just closed it a bit more to make it release slower.

Can I leave the tablets in the dispenser in the hot tub whilst bathing?

For safe bathing it is essential to remove chemical dispensers when using a hot tub, simply remove and then replace once finished with bathing.

Sapphire Waves 1kg 50x20g Premium Chlorine Tablets For Hot Tubs

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Description

💦 Keep your water sparkling and safe—because clear pools are the new status symbol!

UV SHIELDED PURITY - Special formula prevents chlorine loss from sunlight exposure
PREMIUM 90 TRICHLOR STRENGTH - Kills bacteria and viruses for safe, sparkling water
SIMPLE FLEXIBLE APPLICATION - Works seamlessly with floating dispensers, skimmers, and feeders
VERSATILE SPA POOL COMPATIBILITY - Perfect for hot tubs, swimming pools, and paddling pools alike
EFFORTLESS 3 5 DAY CHLORINE RELEASE - Maintains steady sanitation without daily hassle

Sapphire Waves Premium Chlorine Tablets deliver a powerful 90% trichlor formula that slowly dissolves over 3-5 days, ensuring consistent sanitation and crystal-clear water. Their UV resistant composition minimizes chlorine loss from sunlight, making maintenance effortless across all types of hot tubs and pools. Trusted by hundreds with a 4.5-star rating, these 20g tablets offer a versatile, easy-to-use solution for pristine, safe bathing experiences.

Specifications

ASIN	B091D6PS7B
Benefits	Kills bacteria and maintains clean, clear water
Best Sellers Rank	6,971 in Garden ( See Top 100 in Garden ) 115 in Chlorine
Brand	Sapphire Waves
Brand Name	Sapphire Waves
Country Of Origin	España
Customer Reviews	4.5 out of 5 stars 473 Reviews
Item Form	Tablet
Item Type Name	20g Premium Chlorine Tablets
Item Weight	1 Kilograms
Item form	Tablet
Item weight	1 Kilograms
Manufacturer	Stellar Life Ltd
Manufacturer Part Number	20g Premium Chlorine Tablets
Model Number	20g Premium Chlorine Tablets
Number of Items	1
Number of Packs	1
Product benefits	Kills bacteria and maintains clean, clear water
UPC	034966444066
Unit Count	50.0 count

Reviews

S**H

Does exactly what it says

Excellent help keep water quality perfect Very effective, value for money

28.06.2026

J**U

Amazing results highly recommended

These tablets are amazing n completely turnt my green water 2 clear n last ages. Can't believe the results I had. Highly recommend these used in just a standard chlorine tablet float/dispenser bought separately.

1.08.2025

C**S

reasonable price

seems fine

31.10.2025

R**.

Excellent

Perfect size and effective and slowly dissolve giving a balance of chemicals and no nastey smell

2.09.2025

L**E

Very low maintenance with these tablets

Great tablets all in one, hassle free.

11.08.2025

D**J

All in one pool tablets.

Great work well, quick delivery. Thanks

4.08.2025

S**Y

Slow dissolve

Why did you choose this product over others?: It was larger tub than I thought and so were tablets.

6.07.2025

C**N

Best brand ever !!!!

These are the best ones I have come across will not buy any other 5 stars 🌟 highly recommend these

27.07.2025

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Sapphire Waves 1kg 50x20g Premium Chlorine Tablets for Hot Tubs & Swimming Pools

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Common Questions