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

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

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

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.

Makes pond reflective and pretty.

I was quite happy as far as how fast this was delivered. Being a Prime Member is awesome! But, that's how far it goes. I was hoping this dye would work. We usually buy a more expensive dye in a Gallon container. This says it would do an acre per quart, with a 4-6ft depth on average. Our pond is maybe a 1/4 acre with its deepest part being 8ft (and it's extremely shallow on the edges and it loses water rather quickly - some kind of leak). Anyway, we are starting to get some murky water that is almost green. The algae is also starting to thicken up even though we have an aerator. We have had some major rain these last two weeks and it quickly filled up the pond (but it loses water just as fast!) and with the heat, the green stuff is starting to take over!I threw the first half of the container in yesterday and it didn't go very far. No change in the water at all. Today, we threw the last half in. Unfortunately, it only changed the color by a bit - it's still green, just a tiny darker green. Does anyone have a better recommendation? My son loves to fish in our pond but it's just getting uglier and uglier by the day due to the heat/sun!**Since it's only been 2 days, I will update for any changes.

Great value. Unlike the blue dye that looks fake, the black makes your pond look deeper. Does not discolor fish. I've bought other brands that I had to use a lot more of to get the right look. A little of this goes a long way so start with very small amount.

Easy to use, quick to disperse. Results were as expected.

Small pond around an a half acre. Didn’t get it all. I should have just gone to Tractor Supply and got the stuff I used last year.