---
product_id: 16221136
title: "Crystal Plex - Lake and Pond Algaecide Treatment - Liquid Copper Algaecide Kills and Prevents Various Types of Algae (Planktonic, Filamentous, Chara) - 1 Gallon Treats up to 1 Acre"
brand: "crystal blue"
price: "¥27008"
currency: JPY
in_stock: true
category: "Crystal Blue"
url: https://www.desertcart.jp/products/16221136-crystal-plex-lake-and-pond-algaecide-treatment-liquid-copper-algaecide
store_origin: JP
region: Japan
---

# 1 gallon treats 1 surface acre Kills planktonic, filamentous & chara algae 100% safe for humans, fish & pets Crystal Plex - Lake and Pond Algaecide Treatment - Liquid Copper Algaecide Kills and Prevents Various Types of Algae (Planktonic, Filamentous, Chara) - 1 Gallon Treats up to 1 Acre

**Brand:** crystal blue
**Price:** ¥27008
**Availability:** ✅ In Stock

## Summary

> 💧 Crystal Clear Waters, Effortlessly Achieved!

## Quick Answers

- **What is this?** Crystal Plex - Lake and Pond Algaecide Treatment - Liquid Copper Algaecide Kills and Prevents Various Types of Algae (Planktonic, Filamentous, Chara) - 1 Gallon Treats up to 1 Acre by crystal blue
- **How much does it cost?** ¥27008 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/16221136-crystal-plex-lake-and-pond-algaecide-treatment-liquid-copper-algaecide)

## Best For

- crystal blue enthusiasts

## Why This Product

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

## Key Features

- • **Generous Coverage:** One gallon treats up to 1 surface acre, making large pond maintenance effortless and cost-effective.
- • **Broad-Spectrum Safety:** Formulated to be completely safe for humans, fish, pets, birds, and irrigation when used as directed.
- • **Season-Long Protection:** Keeps your pond pristine year-round by preventing algae regrowth and swimmers itch.
- • **Smart Application Strategy:** Treat only a third to half of your pond at a time for optimal results and ecosystem balance.
- • **Powerful Multi-Algae Defense:** Effectively eliminates planktonic, filamentous, and chara algae for crystal-clear water.

## Overview

Crystal Plex is a liquid copper algaecide designed to kill and prevent multiple types of algae including planktonic, filamentous, and chara. One gallon treats up to 1 surface acre of pond water 1-3 feet deep. It is 100% safe for humans, fish, pets, birds, and irrigation when used as directed, but not recommended for koi, goldfish, or trout ponds. Ideal for maintaining beautiful, algae-free ponds year-round.

## Description

desertcart.com : Crystal Plex - Lake and Pond Algaecide Treatment - Liquid Copper Algaecide Kills and Prevents Various Types of Algae (Planktonic, Filamentous, Chara) - 1 Gallon Treats up to 1 Acre : Algaecide Water Treatments : Patio, Lawn & Garden

## Features

- Controls many types of algae such as filamentous, chara, planktonic and swimmers itch for a beautiful and safe pond all year long
- When used as directed, Crystal Plex is 100 percent safe for humans, fish, livestock, pets, birds, swimming and irrigation
- Not for use in Koi, Goldfish, or Trout ponds
- Treat only a third to half of your pond at a time
- One gallon treats 1 surface acre 1-3 ft deep

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000IOBRBY |
| Best Sellers Rank | #10,792 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #34 in Water Garden & Pond Treatment |
| Brand | Crystal Blue |
| Brand Name | Crystal Blue |
| Customer Reviews | 3.9 out of 5 stars 940 Reviews |
| Global Trade Identification Number | 00768980004448 |
| Included Components | 1 |
| Item Form | Spray |
| Item Type Name | algae control |
| Item Weight | 9 pounds |
| Liquid Volume | 128 fluid ounces |
| Manufacturer | Crystal Blue |
| Manufacturer Part Number | 444 |
| Model Number | 444 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Pet Type | Bird, Fish |
| Target Species | Other Fish |
| UPC | 768980004448 |
| Unit Count | 1 Count |
| Warranty Description | No_warranty |

## Product Details

- **Brand:** Crystal Blue
- **Item Form:** Spray
- **Item Weight:** 9 pounds
- **Liquid Volume:** 128 fluid ounces
- **Number of Packs:** 1

## Images

![Crystal Plex - Lake and Pond Algaecide Treatment - Liquid Copper Algaecide Kills and Prevents Various Types of Algae (Planktonic, Filamentous, Chara) - 1 Gallon Treats up to 1 Acre - Image 1](https://m.media-amazon.com/images/I/718k4O+LBeL.jpg)

## Questions & Answers

**Q: Is Crystal Plex safe to use with fish?**
A: This product is safe for livestock, recreation, potable water and not harmful to most fish when used according to label directions. There are a few exceptions, Crystal Plex is not meant for small deco ponds and is toxic to Koi, Goldfish and Trout.

**Q: How often should I use Crystal Plex?**
A: Crystal Plex algae control should be used when algae is present. Wait 14 days between applications and only treat a 1/2 or 1/3 of the pond at a time to recover oxygen levels.

**Q: How do I apply this product?**
A: Apply by mixing and spraying algae.

**Q: How much product do I use?**
A: 13 oz. of Crystal Plex mixed with a couple gallons of water will treat 1,000 square feet.

**Q: When is the best time to treat my pond algae?**
A: Pond algae should be treated when algae is actively growing and water temperatures are above 60F.

## Frequently Bought Together

- Crystal Plex - Lake and Pond Algaecide Treatment - Liquid Copper Algaecide Kills and Prevents Various Types of Algae (Planktonic, Filamentous, Chara) - 1 Gallon Treats up to 1 Acre
- Crystal Blue Natural Pond Cleaner - Muck and Sludge Remover, Safe for Koi - 1 Gallon
- Crystal Blue Lake and Pond Dye - 1 Gallon - Royal Blue Color Treats up to 1 Acre - Clean, Clear & Crystal Blue Water - Environmentally Friendly Pond Dye

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**Shop now:** [https://www.desertcart.jp/products/16221136-crystal-plex-lake-and-pond-algaecide-treatment-liquid-copper-algaecide](https://www.desertcart.jp/products/16221136-crystal-plex-lake-and-pond-algaecide-treatment-liquid-copper-algaecide)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-09-21*