


🌊 Clear ponds, happy fish, zero stress — algae control made simple!
API POND ALGAEFIX is a 16-ounce algae control solution designed for both fresh and saltwater ponds. It effectively removes algae with minimal effort, is safe for all aquatic life stages, and helps maintain crystal-clear water without harsh odors. Trusted by thousands, it’s the top-ranked pond treatment for a cleaner, healthier aquatic environment.












| ASIN | B000SP1WMC |
| ASIN | B000SP1WMC |
| Age Range Description | All Life Stages |
| Best Sellers Rank | #372 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1 in Water Garden & Pond Treatment |
| Brand Name | API |
| Color | Blue |
| Customer Reviews | 4.3 4.3 out of 5 stars (20,911) |
| Date First Available | July 7, 2007 |
| Date First Available | July 7, 2007 |
| Department | Unisex-Adult |
| Department | Unisex-Adult |
| Directions | Note: it is a violation of federal law to use this product in a manner inconsistent with its labeling. For synthetically-lined pond and fountain use only, where all water is contained without any outflow. Before using, make certain that the pond has vigorous aeration, i.e. a fountain or aeration device to avoid fish loss due to low oxygen levels. When algae is controlled and removed by the filter … |
| Included Components | Habitats & Supplies, Pet Crates and Pens, Pet-Habitats |
| Is Discontinued By Manufacturer | No |
| Item Dimensions LxWxH | 2 x 2 x 5 inches |
| Item Package Dimensions L x W x H | 8.5 x 2.48 x 2.4 inches |
| Item Weight | 0.3 Pounds |
| Item model number | 169B |
| Item model number | 169B |
| Manufacturer | Mars Fishcare |
| Manufacturer | Mars Fishcare |
| Material | Plastic |
| Model Name | 972516 |
| Number of Items | 1 |
| Product Dimensions | 2 x 2 x 5 inches; 4.8 ounces |
| Size | 16-Ounce |
| Specific Uses for Product | Teeth |
| Style | Pond Treatment |
| Target Audience Keyword | fish;algae-eaters; betta-fish; bottom-feeder-fish; cichlid-fish; goldfish; invertebrate-fish; mollusks; octopuses; rays; sharks; snails |
G**G
good price and it works.
it works perfectly. I used it once or twice a yr to clean my 3 ponds. 300 gal, 700 gal and 1000 gal.
J**.
Pond algae remover
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
T**M
Great stuff; works well with no adverse effects
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.
P**H
Getting rid of snails
I've tried other costly products to rid my pond of snails like Anhors Away which is no longer availiable. I have 54 Koi ranging from 2' to 8" in my backyard 4k pond and use Algae Fix for my Discus 35gal Aquarium indoors at 1 drop per gallon every week afer a 5gal. water change without any side effects. Anchors Away they claim is hazardous to snails and crayfish only to have return shortly after the treatment is over. I put Algae Fix with the treament of Anchors Away and noticed the small cone shaped snails start to float to the surface dead. I thought maybe I got a strong batch of Anchors Away or the dosage was sronger since I was only adding it to my bog that holds 150 gallons compared to my pond that holds 4K. The bog cleared up and treated the pond with Achors Away so I thought it was a good chance to see if the snails were gone. Since I didn't treat the rest of the pond with Algae Fix the snals returned within two weeks. Then I decided to experiment and tried Algae Fix by itself since I could no longer get Anchors Away. Using the instructions on the Algae Fix container I started to notice that the snail count was coming down. Within a week I only saw one snail in the vortex filter I used on my two bottom drains coming in from the 4K pond. Then about the following week I noticed a large adult snail so I decided to continue a three week treatment, after that I used Algae Fix here and there. I've gone about a month with no Algae Fix additions and no sign of snails. My pond was snail free until put some plants that come with snails in them, thinking that a few snails might be good for the pond. That was till they over populated my filter tanks, and I read that dead snails were toxic to my water column. This product is unsurpassed in killing algae, string algae as well as algae bloom. You may see some brown water that is due to dead algea that must be removed and 10% water change is suggested. My pond is direct sunlight so getting algae to grow is no problem. I do believe there should be algae on the sides of the pond but I hate to see green water. Be sure to have STRONG AERATION with air stones, since dying algae comsumes lots of oxygen, watch fish to see if they are gasping for air at the surface of pond this is a strong indication the water is lacking sufficent oxygen in water becareful follow instructions.
C**.
Crystal Clear Koi Pond Again!
Went into August with crystal clear water in my koi pond... Until algae decided to take over. The water turned green and I couldn't see any of my fish. I came across this product and gave it a shot. Took two doses, and my pond is almost back to crystal clear again. The directions are easy to follow. This product works! And the 21 fish I have in my pond are all doing fine. Highly recommend if you need to clear up your pond. Just make sure you read the directions! You need to keep the pond aerated while using it. I have 2 aerators and a waterfall.
K**E
Very effective but cause my fish extreme stress
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.
A**R
Your algae fix
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.
N**C
Crystal clear water all year!!
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.
D**N
Ordered on 10 January 2025. Delivered on 20 January 2025. Thank you.
R**A
excellent
V**D
It works but expensive for ponds
M**X
It beats buying the smaller bottles.
P**N
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.
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