---
product_id: 78892158
title: "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"
brand: "api"
price: "₩40376"
currency: KRW
in_stock: true
reviews_count: 13
category: "Api"
url: https://www.desertcart.kr/products/78892158-pond-algaefix-16-fl-oz-pond-algae-control-copper-free
store_origin: KR
region: South Korea
---

# Fast-acting algae control Copper-free & safe for plants Treats up to 4,800 gallons 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

**Brand:** api
**Price:** ₩40376
**Availability:** ✅ In Stock

## Summary

> 🌊 Clear ponds, happy fish, zero compromises.

## Quick Answers

- **What is this?** 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 by api
- **How much does it cost?** ₩40376 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/78892158-pond-algaefix-16-fl-oz-pond-algae-control-copper-free)

## Best For

- api enthusiasts

## Why This Product

- Trusted api brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Trusted Legacy:** Backed by 60 years of aquatics expertise, ensuring reliable, professional-grade pond care.
- • **Eco-Safe Formula:** EPA-registered and copper-free, protecting fish, plants, and beneficial bacteria alike.
- • **Massive Coverage:** One 16 fl oz bottle treats up to 4,800 gallons—perfect for large ponds and fountains.
- • **Versatile Algae Fighter:** Effectively controls green water, string, hair, and blanket weed algae for pristine aquatic environments.
- • **Crystal Clear Waters, Fast:** See visible algae reduction within 15 minutes—your pond’s glow-up starts now.

## Overview

API POND ALGAEFIX is a powerful, copper-free liquid treatment designed to quickly eliminate various types of algae in ponds and fountains up to 4,800 gallons. Its EPA-registered formula is safe for fish, aquatic plants, and beneficial bacteria, delivering fast, visible results without harmful side effects. Trusted for over 60 years, this product offers professional-grade algae control that keeps water gardens crystal clear and vibrant.

## Description

With API POND products, it’s easy to keep a beautiful pond. For almost 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because we’re dedicated to making a better underwater world. They work to provide a safe, hospitable environment for fish such as koi, catfish, perch, goldfish and more. At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too.

Review: This product really does clear out algae fast! - 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.
Review: This DOES remove ALGEA without affecting the wildlife - I'm very impressed. - 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.

## Features

- API POND ALGAEFIX – Helps resolve algae problems and controls the formation of new algae; works fast without harm to fish, aquatic plants, surrounding wildlife, or pets when used as directed; includes 16 fl oz for treating up to 4,800 gallons
- Fast and Effective – Controls most types of algae, including green water (Chlorella), string and hair algae (Cladophora), blanket weed algae (Oedogonium) in ponds, koi ponds, and fountains
- Safety First – EPA-registered and copper-free formula is safe for fish and plants when used as directed and won't disrupt beneficial bacteria or accumulate in pond sediment
- How to Use – Ensure that the pond/fountain has vigorous aeration; mix thoroughly into the pond/fountain and disperse evenly; repeat every 3 days until algae is controlled, then dose weekly to keep ponds/fountains clear and reduce maintenance​
- Why API Products? – For over 60 years, we've been a leader in the aquatics industry, developing and perfecting products and solutions for indoor aquariums and outdoor ponds. Today, our family of products includes treatments, testing, and nutrition.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000SP1WMC |
| Allergen Information | Apple Free |
| Best Sellers Rank | #358 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1 in Water Garden & Pond Treatment |
| Brand | API |
| Brand Name | API |
| Customer Reviews | 4.3 out of 5 stars 21,244 Reviews |
| Global Trade Identification Number | 00317163021699 |
| Item Form | Liquid |
| Item Type Name | Pond Algae Remover |
| Item Weight | 4.8 ounces |
| Liquid Volume | 16 fluid ounces |
| Manufacturer | Mars Fishcare |
| Manufacturer Part Number | 169B |
| Model Number | 169B |
| Number of Items | 1 |
| Number of Packs | 1 |
| Pet Type | Fish |
| Target Species | Fish |
| UPC | 317163021699 |
| Unit Count | 16 Fluid Ounces |

## Product Details

- **Brand:** API
- **Item Form:** Liquid
- **Item Weight:** 0.3 Pounds
- **Liquid Volume:** 16 Fluid Ounces
- **Manufacturer:** Mars Fishcare

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/51NAVeYjjYL.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Questions & Answers

**Q: Does rain affect the efficiency?**
A: No, not really. I just clean out my bird bath at least every other week and add fresh algae cleaner

**Q: Why is my aquarium still green??**
A: Because this stuff doesn’t work

**Q: Can i use algaefix and simply clear together in the same dosing of my fountain?**
A: Yes, you can use any of the API products in conjunction to each other.

**Q: How long after treatment can pond water be used to water plants in garden?**
A: The product lasts 48hrs within the water column. Please contact API if you have any additional questions.

## Customer Reviews

### ⭐⭐⭐⭐⭐ This product really does clear out algae fast!
*by R***N on April 28, 2026*

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 DOES remove ALGEA without affecting the wildlife - I'm very impressed.
*by D***E on November 8, 2016*

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.

### ⭐⭐⭐⭐ Price went up.
*by R***. on July 31, 2026*

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

## Frequently Bought Together

- API POND ALGAEFIX Algae Control 16-Ounce Bottle (169B)
- API POND ACCU-CLEAR Pond Water Clarifier 16-Ounce Bottle
- API POND-ZYME SLUDGE DESTROYER Pond Cleaner With Natural Pond Bacteria And Barley, 1-Pound Container

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-09-07*