API POND ALGAEFIX Algae Control 8-Ounce Bottle

It absolutely works. In 3 days, the algae is beginning to be under control and the water looks much more clear. It will likely continue to get more and more clearer in the next few days.

This product works just like the product description said. The price is reasonable. It takes absolutely no time or effort to use. The water stays crystal clear for weeks. There is no harsh smells during or after application. Great product

Works better than any other product I've tried to control various forms of algae in a 3000 gallon pond. Water gets and stays clearer than I've seen it previously when using other algae control products. I don't have any fish to be concerned about but it hasn't harmed any of the water lilies or other pond plants. Only downside is for me it can be a bit expensive if I use as much as the directions say every week, so I'll often stretch out the applications to a lesser frequent schedule and I've found a frequency that works well for my situation.

it works perfectly. I used it once or twice a yr to clean my 3 ponds. 300 gal, 700 gal and 1000 gal.

This stuff is fantastic. I have a 7,000 gallon koi pond with 22 koi ranging from 12" to 30" in length. Average is 20". I'm a heavy feeder, I also feed twice per day. The pond is in full sunlight and circulates 8,000 gallons per hour via a 100' long 3' wide river with a 3' wide waterfall. What does all that mean. It means the water get's plenty of oxygen and sunlight and therefore grows green algae by the ton! The normal water color for the past 7 years has been pea green! I have lots of filtration, a huge UV filter and I've used hundreds of dollars of good bacteria. NOTHING kept the algae out for the past 7 years. ----> this year I decided to try a chemical to clear the water or get rid of the pond. I read everything I could find and decided this was the best chemical “experiment”: " poly oxyethylene(dimethyliminio)ethylene(dimethyliminio)ethylene dichloride ". This chemical is packaged under several different names and a concentrated version can be purchased at swimming pool suppliers. (concentrated is 20%, much thicker, more like syrup) The chemical kills algae AND causes it to clump and float to the surface as foam. It will clog your pond filter in a blink because of the clumped foam dead algae. Be prepared to clean the filter often. The chemical is "consumed" as it kills algae and my water was so green I added 7 times the dosage over a period of 3 weeks. The color tuned from pea green to a gray green slowly. I had to clean the filter every couple of days for about a month. ===>>> the water is now crystal clear. I now add about 3 ounces every 2 weeks and the water stays crystal clear. Every time I add there's a little foam on the surface, the filter clogs up within 48 hours, I clean it about 60%, not 100%, and I'm good for another 2 weeks. I'm very pleased with the results, ===>> How did the fish and plants do? It never phased them one bit. Not one bit. They didn't come up gulping for oxygen, it didn't faze any of the many frogs or billions of snails that inhabit the river, NONE of the lilies or water lettuce or other plants were affected in any way. I don’t have any experience with other fish other than koi. This is the chemical, sold under several different names: " poly oxyethylene(dimethyliminio)ethylene(dimethyliminio)ethylene dichloride " The dosage will vary by vendor depending on the concentration. The 3oz per 7000 gallons every two weeks I use is a 20% concentration I purchased at a swimming pool supply store sold under a different brand name. I have tried three different brands of this chemical (including this one) and they all work exactly the same. The only difference is the dosage which varies based on the concentration, ranging from 4% to 20%. Attached, 2 pictures, before and 45 days later, after.

I'm torn when it comes to this product. I started using Algaefix last year, and the results were truly incredible. Overnight (quite literally) my pond went from a soupy, stringy mess to see-to-the-bottom clear. So of course, I bought more of this for the 2015 season. After my first application this year, I'm wondering if they switched to a new formulation. Here's why: Our pond had a pretty heavy algae bloom this spring. The water was green and like last year, I had a lot of string algae and floating algae. I dosed the pond with the same amount of Algaefix that I used last year and like before, the water cleared up significantly overnight. However, this time around, my fish were VERY negatively affected. I have a few small koi and a few goldfish in my pond and when I checked on them the morning after treating, they were all hanging listlessly at the surface or on the floor of the pond. Those at the top weren't gasping, just hanging there. They were so sluggish that I was actually able to reach in and pick one up with the fish putting up almost no struggle! I thought for sure they would die. I have a waterfall, a spitter, and two aerators in my pond, so this was clearly not a result of having too little oxygen (something the directions warn of for this product). About three days after treating, the fish are now moving around again. I'm torn as to what to do and how to rate this product. On one hand, it does work, and it works very well. However, I'm concerned that continued use may stress or even kill my fish. If you have fish or other aquatic animals, you might consider trying something else first. If you're fighting a really bad algae infestation or don't have aquatic animals, though, this is admittedly a good product for removing algae quickly and efficiently.

Tried others none of them worked as well as this one did! We didn’t have any mold or algae all summer, water was crystal clear. Will purchase this again and again! Recommend highly for water fountains.

I've been using this product for years now - I had it on subscription so it sent me a bottle every 6 months. It was all fine until this latest bottle. I put it in a tank and it killed 5 fish. Thinking I may have just mixed up the dosage, when I used it again, I was super careful about dosage. If I didn't notice them acting funny a moment too late and pulled them out and gave them fresh water, another 5 would have died. There was a very strong filter with waterfalls and airs stones, so it wasn't oxygen deprivation. Again, I thought maybe it was just too concentrated for aquariums, so I kept the bottle. I put the baby koi I had in the aquarium out in the pond. There was a lot of algae so I put in the dosage required. It killed one of my adult fish that I've had for years and 3 of my 5 babies. The other two are not out of the woods yet and I've done 2 water changes and its been 3 days and I'm worried about my other adult fish. I was hoping for mating this year, but I doubt they will be able to because they are so close to death. All my mosquito fish except 5 (out of about 1000) have died. Again, this is not about oxygen deprivation, they aren't gasping at the surface. they flash, then die at the bottom of the pond. They won't even float after the death. I don't know what was wrong with the bottle, but don't trust this product. If its bad, it will kill everything and I'm so horrified to loose all my fish. I've been having nightmares and its just awful. DO NOT BUY THIS PRODUCT!! Edit: contacting the manufacturer does nothing either. They won't answer their phone and won't reply if you leave a message. They send a sweet little "call this number" email to every negative review, but apparently won't actually do anything about it. Terrible customer service. I refuse to buy any products by them now. Edit #2: So, I realized that I miscalculated the pond size and thought it was half the volume it actually was. So I was putting in half the recommended dose and it STILL killed my fish