Supa Anti Algae Block, The Block Slowly Dissolves Releasing Di-Methyl Urea Into The Pond Water Clearing Algae From Ponds.

Start off with small amounts it works

This doesn’t work - it’s dissolved in the pond over 2 weeks and the water is as green as it was 2 weeks ago. I would give it no stars if I could

My pond was already full of that 'green soup' and put this block in. The next day I could see a significant improvement.Did not clear, as expected, as more a preventative than cure I think. Will be ordering some more due to its affectiveness and hopefully pond will be clear by next summer (will use as a preventative next time).Just to add, my pond is for decorative purposes only so no fish and no pump installed either. So if there is a significant improvement without a pump installed could you imagine the results with a pump. I would presume it would work better - obviously I can't give an opinion on this.Also, a fast and speedy delivery

Takes a while to work

This really does work!! I have tried so many different things to no avail but this has made a huge difference to my 1000l pond

Fantastic, cleared my pond water in a couple of days!

It did not work in my pond, I bought 2 and after waiting 3 weeks for the first block to work i used the second one, to no avail, I have been sorting out ponds since the 1950s and have gone back to my original cure all, BARLEY STRAW, but Supa was cheap and I thought I would give it a go,if you know of a farmer who sells Barley straw (make sure it is Barley) buy a bale and store it, it will keep for a year, we used to buy ours and split it with friends who also had ponds, you can use a sock, stockings are better, fill it with as much straw as you can, also a large round stone in the toe section, tie it securely and lower it in, Barley gives off vapours which kill off all the rubbish in the green water including blanket weed, the latter will need to be removed with a long stick using a twisting motion, my current pond is 6ft X 3ft and approximately1ft 6inches deep. hope this is a help to someone?

Easy to use, chucked this in my 180l small pond over a month ago and still green, unfortunately not cleared the green water, I’m going to have to buy something else.