API Pond Algaefix Algae Control Solution

Rated 4.2913 out of 5 stars


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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

2.5-gallon bottle treats up to 96000 gallons.

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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 4.2913 out of 5 stars
103 Ratings
Would recommend to a friend

101 Customer Reviews

Rated 5 out of 5 stars
By sancalva on Mar 23, 2023

clears water

this is hands down the best way to clear up algae. follow the directions! dont add more thinking it will work faster. it will, and it will kill your fish and plants you want. take the time to do it right, it clears up water and fish and plants you love thrive. but read the label, know your pond water volume and measure. i have been using this for 10 yrs or more now. start in spring, get on top of it, then occasionally add as needed , if needed in summer to fall.

Rated 3 out of 5 stars
By Peggy on Aug 29, 2023

The cost has gone up and is too high - the delivery was longer than normal

Rated 5 out of 5 stars
By KoimanAZ on Sep 14, 2023

Works Great!

AlgaeFix is great to fight string algae if you don’t have UV!

Rated 1 out of 5 stars
By ANDREW on Oct 12, 2023

Will not remove green algae.

Will not remove green algae.

Rated 5 out of 5 stars
By Linda on Jun 16, 2023

Pond cleaner

I’m glad you gave it in the gal size.

Rated 2 out of 5 stars
By Tyleete on Jul 3, 2022

Don't use of animals drink

It helped clear algae from my pond,but at the cost of all the animals I take care of suddenly no longer using it. They refuse to drink (or swim) and have gotten to climbing the bird bath instead of my 15x22' pond.:/ Built just for them. Used this with another of the company's algae product. Stated safe for animals. They're telling me different. Attaching a pic from before I used product. They used to love the pond before the second dose of this stuff. And a night vision shot of how desperate the raccoons are after I put in this stuff. Sucks

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


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

Rated 4 out of 5 stars
By Ashley on May 3, 2022

Do your research

While this did kill the algae, we also lost fish. There's a warning about oxygen levels dropping while using this product, which is the likely cause of death. With more research and perhaps professional opinion, this may have worked as intended without any losses.

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