Pond Worx Black Lake and Pond Dye - 4X Concentrated Liquid Pond Colorant – Shades and Protects Your Pond, Treats up to 1 Acre –1 Quart

Amazing product. Just pour it from land or dock and by the next day the whole pond has turned to whatever color you used.

I bought the product April 6 - sprayed in my 1/2 acre pond on April 9 - looked great until April 11. Can’t even tell I put it in. Very disappointed! As a follow-up - my apologies, the pond was turning over. The color reappeared four days later and now has an excellent dark color.

I have a 1/3 acre farm pond, with over 10ft depth in the middle. I was dealing with some nasty algae growth for a while during summer. I have no water circulation, so I needed something to take care of the problem. I used half of this bottle along with some Pondworx Pond Bacteria, and it sure did clean up the pond very nice - took a while, but it worth it. I really love the black color - which I originally wanted the blue dye, but I am very glad that I accidentally ordered black instead. We'll see how long it takes for the dye to dissipate, but I will stick to this product because it worked for me.

Didn’t work for my 1/4 acre 7’ deep. Didn’t change color at all and I put more in then I was supposed to.

The bottle is advertised as sufficient for 1 acre at a 2-4 foot depth. That seems to about right to "slow" vigorous bottom growth at depths of a foot or deeper in spring and fall. Dye distributes thoroughly when poured directly into the water along one side of the pond leaving a pleasing "dark" color. After using one bottle Pondworx every month (when air temperature is >50F), the shallow bottom remained visible. The water is not dark enough with one bottle to discourage large herons. Presumably the dyes are absorbing light in the spectrum supporting photosynthesis. Maybe the seller should provide a figure depicting what light frequencies the dye blocks compared to what light frequencies algae and other plants use? Does more dye actually block more photosynthetic light? I do not know. During long summer days, I found better control with a second bottle each month for my one acre pond 2-4 feet deep.

Product works just as described. Very happy with the results. Pond looks great.

I ordered black and received blue, so my comments are for the nature's blue dye instead. This stuff is super concentrated. I got a tiny speckle on the back of my hand, and the sink turned bright blue when I went to wash it off. I added roughly 1/2 cup to an 11,000 gallon pond, and in less than an hour the whole pond is very blue. I'm giving it 3 stars because it definitely works, but I think the colour nature's blue looks somewhat artificial, like a swimming pool. But a little amount goes a long ways and hopefully it will still help to block sunlight and discourage algae growth in the pond. I think black would still be better, maybe mixed with blue, would look more natural. Since I didn't wear proper gloves (my mistake) my hands turned Smurf blue. Wear rubber gloves! However, I found that strong Palmolive dish soap was effective and got off 99% of the colour with only a few minutes of vigorous scrubbing, so its not the end of the world. Also, I spilled a little on my flagstone walking path, but a light rain 2 days later washed it completely away, so my worries for long-term staining from small drips is no longer a concern either.

Love this is black and not fake blue, works great.

Used in a small 2m by 2m by 0.5m pond. Couple of cap fulls added to the pond (diluted in a watering can with 3 gallons of water) turned the pond inky black. Remains dark black for weeks and then just needs a cap full from time to time to maintain the deep black colour. Makes the pond look great without affecting the plants or wildlife.

This product works as advertised. A very small amount, less than an ounce is sufficient to darken the water in our pond to black/

Best product Ive found for blackening my small pond - lasts long time

Misleading description

Water darkening for less algies. Very little required.