envii Sludge Klear Pond Sludge Remover, Natural Bacteria Sludge Buster Digests & Controls Organic Waste, Safe for All Fish & Wildlife, 6 Tablets treats 30,000 litres

Worked brilliantly. Pond before was basically black. Now it is clear! Awesome. First 2 photos are before. Last 2 photos are after.

Product seems very good delivery took a long time

This item arrived quickly; it was surprising by its size and was put through the letterbox. We had little confidence it would make significant difference to the pond when the water was already a gloomy shade of black, and signs were apparent that the sludge was already breaking up. The instructions were a little confusing but this was not helped by our spectacular ability to overlook the most obvious requirement - to dissolve the first two tablets in pond water. We dissolved them in tap water! The third dissolved tablet we forgot about and promptly watered the garden with it. Oh dear, not much hope for good results at all. We also put one of those barley straw pouches in the water at the same time. Yet in a couple of weeks the look of the pond was transformed. We cleaned the pump filter (which was full of sludge) maybe four times, but the water, while not devoid of bits that can be churned up, is clear down several inches. Previously, fish could only be seen when feeding on the surface. The product seems expensive for not much in the container, but we would highly recommend as extremely effective.

At first you will wonder if you wasted your money, but this product does work. I started my application 6 weeks ago & only just started seeing the results.

Perfectly happy to use this product and the fish are extemely grateful too. :-)

We have a 2,800 litre pond which is stocked with goldfish. It has never been emptied since we filled it 7 years ago! We now have a small in-pond filter with UV and this has killed off a lot of algae, making the pond water somewhat clearer. We use Sludge Klear to lift dead leaves and remove dead algae. It clumps together the algae in large ‘bergs’, also bringing semi rotted leaves to the surface. You can then lift these off with a fine mesh net (which dead algae doesn’t fall through if you remove it carefully). Initially the water is cloudier but after a few days (and remival of a few bergs, the water clears a bit. We are doing this weekly at present, in the expectation that the water will gradually clear. This is not a product that achieves a fast result but neither does it damage fish (or any other creature’s) health.

pretty sure it worked but then the pond filters kept getting blocked so wether it actually broke down the sludge is hard to tell

Very clever marketing for products that don’t work. You buy their pond clear and that causes more algae to grow. You buy their algae product and then you need the sludge clear. It goes on! I don’t rate them at all.