Airmax 4X Concentrated Black DyeMond, 4X Liquid Concentrate, Treats Like 1 Gallon, Ecofriendly, Clean & Clear Water, No Mixing & Easy to Use, Enhances Natural Color, Treats up to 1 Acre, 1 Quart

This product did help to keep the algae down but made it harder to see the fish until the came to the surface

Controling algae growth in a pond is a constant battle. The problem with most pond dyes is the resultant color -- they make the pond look artificial. Airmax black pond dye gives a very natural look to the pond. And, most importantly, it stops the growth of the algae. It is very important that you know how big your pond is. My pond is about 3/4 of an acre and averages about 5 ft. deep. One container of Airmax did the trick. It's been 3 weeks and the pond still looks great. I'm hoping to have the pond dye work for several weeks before having to add another container. Obviously, the more it rains (and the water overflows out the drain) the more frequently pond dye will need to be added. I definitely recommend this black pond dye.

i have bought this pond dye several times and it is good . i always order the black dyemond colorbut the last time they shipped me the wrong color and shipped the blue color which is not dark enoughto suppress weed growth. always be sure to check the color you recieve.

I have a 1500 gallon gold fish pond and a 7000 Koi pond that were looking a little sad and brown here in winter. And since the water clarity was good I was concerned about the views that might be open to heron, raccoons, possums. Yes I live in the city but have a nice woody acre. So I decided to try the Airmax Black Dye because the blue dye doesn't look good on waterfalls. Well the black is very pretty black with very little product used, but the water coming over the waterfalls looked neutral. That was good. The water in the test tubes for ammonia, nitrites, pH etc was clear so that tests were accurate. That is good. I hope that the lack of penetrating sunlight may slow down string algae as it warms up. But the darkness does not seem to affect water temp. Thats good. And the ponds looked really cool, deep black with the reflection the ads talked about. Until I decided to put some Natures Blue in one to try to get the Twightlight Blue that Airmax also makes but that I didn't buy. Unfortunately it did what ll blue dies did: make it a very pretty but unnatural blue across the waterfall and at the agitation at the bottom of the falls. When I received the products there was a slip enclosed that asked that if I could't give them 5 stars please call or email. I had 2 issues that were going to take my rating to 4 stars so I did as asked and emailed them my feedback. Much to my surprise I didn't get a defensive answer or an excuse as to why they must do what they must do. I got a real back and forth conversation that specifically addressed the feedback I was going to give about dosing for smaller ponds. As a result of the time and interest they took with someone who only spent about 50.00 with them, they have created a repeat customer. So my feedback is that the product is good but use increments of a half or one ounce at a time. If you have a waterfall the Natures Blue will make it look very blue...very bright blue, and I think unnatural. I am going to stick with Black or try Twilight Blue. Thanks Steve! You were a Blessing.

Product arrived on time. 1 quart in my 12 acre feet volume pond noticeably darkened the water. I believe I will add another quart, which I ordered at the same time, to get closer to tea color than bluish.