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

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

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

Did what it said, water is black all over the hold pond

I find that it really doesn't help. I put a hole bottle in a pond thats only 110' by 70' so not truly very impressed and I used it a least 30 + times over servals years. I going to try something else!

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.

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.

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.

In September i purchased a blue (Pondworx Lake brand) and a black (from other company) as i wanted to try them out on my ponds. I put 2 ounces in my 5,000 gal pond and it worked great. The blue tint actually lasted 4 months (although in the fourth month it was slowling vanishing). i tried the black product in my other pond and i nearly had to put the whole bottle in to get it completly black. In December, i needed black for the same pond and decided to use the Pondworx Lake product so i purchased it and it has worked great.

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

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.

Misleading description

Water darkening for less algies. Very little required.

Ce colorant semble efficace pour freiner la prolifération des planter indésirable et des algues.