API Pond Algaefix Algae Control Solution, 32-oz bottle - Chewy.com

API Pond Algaefix Algae Control Solution

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About This Item


  • Effectively controls green water algae, string or hair algae and blanketweed in ornamental ponds.
  • Helps keep ponds, water gardens and ponds clean and clear.
  • Algaecide controls existing algae and helps resolve additional algae blooms.
  • This algae solution is safe for live plants and pond fish.
  • Do not use with freshwater crustaceans, including shrimp, crabs and lobsters.

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Learn More About API From Our Team of Experts

Special Note

32-oz bottle treats up to 9600 gallons.

About API Pond Algaefix

Why Use API POND ALGAEFIX Algae Control?

Algae growth can appear as “green water” blooms, “pea-green soup”, filamentous algae on plants, or as floating mats known as blanket weed. Algae grows when there are excess nutrients in the water—usually in spring prior to plant growth or during summer in direct sun. API POND ALGAEFIX Algae Control works quickly to control algae growth and keep ponds, water gardens and fountains clean and clear.

Controls Most Types of Algae

Before Using

Make sure your pond has vigorous aeration to avoid fish loss due to low oxygen levels. When algae is controlled and removed by the filter or settles to the bottom of the pond, oxygen may drop to harmful levels without adequate aeration. Pond water also carries much less oxygen in warm weather.

Algae Types

API POND ALGAEFIX helps control three main types of algae:

1.    Green Water Algae (Chlorella)

2.    String or Hair Algae (Cladophora)

3.    Blanket Weed (Oedogonium)

How to Use API POND ALGAEFIX Algae Control

Treating your pond to control algae is simple. For best results, be sure to read and follow all label directions.

Step 1

Vigorous 24-hour aeration is required during treatment. Do not shut off pond pumps or aeration devices at night.

Step 2

Remove as much algae as you can by hand before treating your pond.

Step 3

Disperse API POND ALGAEFIX evenly around the pond and thoroughly mix it into the water. DO NOT OVERDOSE.

Step 4

As algae dies off, remove as much of the dying algae as possible.

Calculate Pond Volume Before Use

To ensure accurate dosing, determine your pond’s volume and then use the dosing chart to figure out how much API POND ALGAEFIX to use. For square and rectangular ponds: avg. length (feet) x avg. width (feet) x avg. depth (feet) = cubic feet of water. Cubic feet of water x 7.5 = volume in U.S. gallons. For round ponds: top diameter (feet) x bottom diameter (feet) x height (feet) x 0.785 x 7.5 = volume in gallons.

About API

The team at API has a passion for fish and understands the rewards and relaxation fishkeeping can bring. For almost 60 years, they have developed premium products with a focus on proven and effective results. API offers a range of testing kits, water conditioners and nutritionally superior fish foods. They are dedicated to making a better underwater world for the benefit of fish and those who keep them.

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Questions & Answers

18 Customer Questions

Will this hurt my out side dogs they drink out of my pond
Answer by ChewyJul 03, 2019
It is safe for any wildlife or domestic animals to take a drink or swim in treated water as long as the dosage is correct for the volume of water being treated.

Can this be used in concrete fountains - uncoated and coated?
Answer by ChewyJul 06, 2017
API PondCare Algaefix Algicide is for synthetically lined pond and fountain use only.

How much Algaefix Algicide is needed per gallon. Our pond is approximately 1,000 gallons. This will help determine how much we need to order. Ty
Answer by ChewyDec 21, 2017
To ensure accurate dosing, determine pond volume before use. Add 1 teaspoon for each 50 US gallons of pond/fountain water or 1/4 cup for each 600 gallons of pond or fountain water. Thoroughly mix into pond water by adding near the pump outflow, waterfall, or aeration device. It can be mixed in a bucket of pond/fountain water and dispersed evenly around the pond. Repeat dose every 3 days until algae is controlled. Be prepared to siphon out dead filamentous algae. Once algae growth is under control, add one dose per week. Weekly treatments will control algal growth and reduce pond maintenance.

Hello! Should AlgaeFix and the sludge remover (EcoFix, I believe) be used at the same time, or should the sludge remover be added after all the Algaefix treatments are completed? Thank you!
Answer by ChewyApr 20, 2018
It is best to use this supplement on it's own until the algae is controlled.

ReviewsWrite a Review

Rated 4.3656 out of 5 stars
93 Reviews
Would recommend to a friend

93 Customer Reviews

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Rated 4 out of 5 stars
By Lolita on Sep 16, 2022


We have used this product for a long time. We are very pleased with how it helps.

Rated 5 out of 5 stars
By kimmy on Jun 2, 2022

good product

nice size bottle of algae fix-good product that works well

Rated 5 out of 5 stars
By Rickster on Apr 1, 2022

Pond maintenance

Good products, good price, fast delivery , local supplier, support pa business

Rated 5 out of 5 stars
By Joey on Apr 6, 2022

Works as Informed

Followed instructions to the t and product worked in 2 days.

Rated 1 out of 5 stars
By Linda on Aug 22, 2021

Horrible packaging

Ordered this along with 5 litter pan deodorizer sprays. They packed them all together and I’m assuming because the algaecide was a gallon and the cat spray was small it caused the algaecide to leak along with the cat sprays. What a mess. I called and questioned why they would pack them together and she said she would ship out a replacement but packed in separate boxes. NOT. They all came together again and this one leaked. Ridiculous

Rated 5 out of 5 stars
By Tubwater on Jul 30, 2021

Very Effective

I bought a house with a 3000 gal koi pond/fountain not long ago. The pond is equipped with 2 stages of filtration. The previous owner fought murky green water for years with limited success. The very large, brightly colored Koi were barely visible. I started looking for an algaecide and settled on API Algae Fix. Within a few weeks the pond was crystal clear and remains so with regular treatments. I read several comments about the danger to fish. I have several large, valuable Koi so I was very careful to follow instruction about dosing. I measured the pond carefully to get an accurate water volume including the volume in the filtration and circulating system to determine the proper dosing. My pond is also equipped with a secondary aeration system which ensures adequate O2 saturation. This product is very effective and safe for fish but the buyer should follow the directions and warnings carefully. I am very satisfied with the product.

Rated 5 out of 5 stars
By cdavis5534 on Jul 11, 2021

Outstanding purchase

I was amazed at the purchase I made for some very expensive pond algae preventer. Algaefix is the best product I have found to prevent algae growth in our pond. We have a 10,000 gallon pond so we go thru a lot of this stuff. When I found it online at Chewy the price was not to be believed! I saved a bundle and they shipped it in a day! I will always check Chewy's prices now before I purchase anything for my pond!!!

Rated 5 out of 5 stars
By Ellen on Sep 1, 2021

Algaefix works!

We have a new small pond and waterfall. It developed a bit of algae since we don't have any fish in it. The Algaefix worked after 2 doses. Very happy with the product.

Rated 4 out of 5 stars
By Anna on Aug 6, 2021

Algae mostly gone

After more than a week of treatment every third day the stringy algae almost Gone. There is still a little on bottom so another treatment last night. Tough algae to get rid of.

Rated 5 out of 5 stars
By Algeafix on Aug 28, 2021

works great

I have tried a couple other treatments for my fish pond and without good results. This stuff works great. Love it