API POND ALGAEFIX (16 fl oz) Pond Algae Control - Copper Free - Clean, Clear Water - Up to 4800 Gallons - Safe for Fish & Plants - Water Gardens, Fountains - Natural Active Ingredient - EPA-Registered

This stuff is amazing! I have a 40 gallon freshwater tank with lots of tropical fish in it. My tank is well established, but I've been having some issues with algae growing on the tank decorations and on the glass. I do water changes about once a week, I also have a very good quality canister filter. But managing the growth of algae was a major problem. So I bought a bottle of the Algaefix and I used exact as directed on the bottle. Within a few hours my tank was crystal clear. I couldn't believe how fast and efficiently it worked. I'm happy to report that all of my fish are doing very well. This product did not harm them at all. I definitely recommend this to anyone who's having an issue with too much algae growth, just be sure and follow the directions on the amount to use.

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 like this product but the price keeps going up. I will buy elsewhere.

This is the answer to a prayer. My fish pond started getting really green and murky so it was time to find the answer-this is it. Within hours it was clearing and following directions it has stayed clear. The fish are so happy! So am I! Don’t hesitate if you have algae problems order this and find yourself with a clear and sparkling pond.

Great for our small pond! It works! Really well. Like a different CLEAN pond since using. No muck on bottom

It is clearing the algae but it's killing my goldfish

I had nasty green algae in my yard pond so thick you couldn't see. I used this one time and the algae was gone by the next day. I have tadpoles and frogs all over and it didn't seem to harm them. I do not have a pump in there right now so I wasn't sure but it worked great. I didn't use my h at all. Well worth it.

NOT for koi! DO NOT BUY FOR KOI POND picture of my pond for attention so my review reaches more people. I have a 500 gallon and some change stock tank pond for my koi. I have spent HUNDREDS of dollars trying to save koi that were dying all along from this stupid ass chemical. Went so far as replacing my tank to a rubber one because I was convinced the heat was leaching zinc from my old tank. WHOLE TIME it was this algaefix. I even used this treatment 3 different times with 3 different doses trying to give it benefit of the doubt and playing trial/error because I could not believe a fish safe treatment WITH KOI ON THE FRONT OF THE BOTTLE could be killing my fish. $500 replacing a tank and $200 worth of koi GONE because of whatever toxic bs is in this bottle!!!! The first time, I used the properly measured dose for 400 gallons (I always under measure bc I’m careful about toxicity). All fish dead within 2 hours. The next time (remember I had no idea this was the cause of death) I did 1/2 of the recommended dose (thinking maybe my math was wrong the first time just being careful) 2 fish dead over night the other 2 I was able to save in an emergency tank. Fast forward, I replace my tank with a rubber stock. Move my 2 fish I saved back outside and got 2 more fish. They’ve been fine for the last 2 months. It’s been 110 degrees this week, I’m having a bad algae bloom so About 30 minutes ago I added ONE teaspoon of algae fix to 400 gallons of water and all of my fish are gasping at the surface. 1000% confirmed that this algaefix has cost me $700 and a collective 70+ hours in fish rescue and pond demo. DO NOT BUY IT. I will now spend all night FOR THE THIRD TIME trying to keep my fish alive diluting pond water and using every form of aeration I have for the next 5 hours because of this sorry ass good for nothing company. Kiss my ASS API

Ordered on 10 January 2025. Delivered on 20 January 2025. Thank you.

excellent

It works but expensive for ponds

I was really struggling for a couple of months to control an algae bloom using natural barley straw type products as I didn't want to hurt my fish, turtle or plants but it was a losing battle after reading about algaefix and it claimed not to hurt fish and plants if used correctly I decided to give it a try. I saw results the day, after two weeks and 4 doses the algae is all dead and almost all gone, the sludge destroyer I bought with it has done a great job gobbling up the dead algae. It has not harmed my fish, turtle or plants. Great stuff, it works !

Amazing results on just two days. Two months of algae bloom due continuous rain and sunny weather. Never experienced this in with my pond before. Fishes could no longer be seen. Fantastic API Algaefix ... My pond is restored to be crystal clear again.