Envii Water Butt Klear – Natural Water Butt Treatment & Cleaner, Cleans & Prevents Green Water & Unpleasant Odours, Keep's Water Healthy & Feeds Plants – 20 Tablets

After reading of other gardeners suffering from stagnant and smelly water butts, I looked around for a suitable solution; these small tablets certainly work. They clear the water and rid the butt of those unpleasant smells quickly. The pack contains a decent number of tablets (12 I think), so they'll last the Summer into Autumn.Recommended, as it does what it says it will.

The product worked well and I no longer have a stinky butt.

Seems to do the job. Easy to use.

I followed the instructions on the packet and now waiting to see the results

They do what there supposed to but the smell does come back so multiple treatments are needed, I’m using two barrels collecting rain water from a shed and greenhouses , stinks a bit in the summer months

Does what it says on the... packet!

Purchased the tablets to deal with insects breeding in the water butts

The water clarity improved and the odour was less pungent