Sapphire Waves 5 in 1 Multifunction Chlorine Tablets for Hot Tubs, Spa, Swimming Pools. 1Kg Tub 50 x 20g 1" Spas Paddling Pool Hot Tub Chlorine Tablets for use in Chemicals Floating Dispenser.

Easy to use, just pop them in a dispenser. These tablets have worked fantastically at keeping algee out my pool. I have a 7ft rectangular pool with a pump. The tablets are big. I filled the pool on Monday 11th and used it everyday for a week. It's now Monday 18th and the water is crystal clear and there is no slimey algee on the sides or bottom. The tablets dissolve very slowly. I put 3 in the dispenser on Monday and they didn't fully dissolve until Friday. I believe the slow release makes it more effective in keeping algee away. The pic with 2 floats was taken on the first day after I filled it and the pic with 1 float was taken five days after being filled and used everyday.

Brilliant all in one solution for hot tubs. This is the first summer we have used Sapphire Waves and I am more than impressed with them the tub water was as clear at the end of summer as it was at the beginning.

Great product

Really good and do the job well

Does the job nice clean safe hot tub.

The best tablets I’ve used in my hot tub rarely need to add anything else to the water one tablet lasts around three days too

I bought these for use in a 10ft paddling pool. There are no specific dosage instructions and I didn't have a floating dispenser so just threw them into the pool. They kept the water clean looking but bleached the colour out of the base of the pool. I would use with caution! They were in the pool approx 24hours and barely changed in size.

Does the job it is supposed to do.