Hydra Liquid Black Dye | 250ml Treats up to 1063L - Concentrated Liquid Dye for Ponds, Water Features & Fountains | Pond Dye Keeps Water Safe for Wildlife

This product not only deflects the suns rays , preventing the formation of algae, Not only makes the water look beautiful, I chose black which sets off the white water lilies I have, but most importantly for me, is harmless to plant and wildlife. I’ve bought in the past, and will continue to do so. First class .

Great purchase , glad I found this . We have a pond in our back garden and algae was starting to be a real problem. This black dye soon stopped the algae , the black mirror effect on the water is also amazing. The fish in our pond are still all good and healthy . We mainly use the dye , in summertime . Excellent buy !!!!!

Makes your pond or water feature more interesting and reflective.Just be very wary about how much you add.According to the instructions, I'd need twice this amount for the desired effect; I added only half the bottle, but if any thing, the water is a bit too dark; I lowered something in the pond, and it disappeared from view completely half a metre down.Don't know what the fish think of it, but they still come up to feed, so I guess all is well.

The dye is great. I first saw this being used on a gardening program. Definitely makes the water feature have mirrored effect. You only need a little bit and you can top up when required.

The dye does change water to black but... its also a very faint purple coming through the fountain spout. Tried adding a drop more.. no change. BUT, beware.. it does stain rocks and stones that are in the water!! Not really pleased about that 😕 Topping water levels up, there's no sign of the water fading and from spout its now clear. I will have a go at scrubbing them once fountain is emptied for the winter... fingers crossed!

Works a charm. Waited until the pond had cleared (it had new pond syndrome - gone dark green about 6 weeks after it was filled, and then went clear again a few weeks later) and then used about half the bottle into the 400 litre pond. Went deep black and looks great like it's a mile deep. You want to be super careful not to dribble any on yourself, your clothes, the slabs around the pond etc... It's been a couple of months now and there's no sign of it fading.

Used it for years ,,does the job

Wear gloves if you don't want to get the dye on your hand. Takes a bit of washing