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.

Very good product so much easier than having to weigh out granules every time to add chlorine to my hottub

Great product

Water is Cristal clear, used granules before which was a pain, been using this in a 9 seater hot tub for the last 2 months, 1 tablet every 3 days but I do have the spa at 38.5 and it keeps the water very clear. Went away for a few weeks and just filled up the dispenser with a few tablets to they dissolved and the next one dropped down, when I came back the waster was still still perfect. Wished I used these years ago.

Really good and do the job well

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.

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.

Just as expected