Is Crystal Plex safe to use with fish?

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.

How often should I use Crystal Plex?

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.

How do I apply this product?

Apply by mixing and spraying algae.

How much product do I use?

13 oz. of Crystal Plex mixed with a couple gallons of water will treat 1,000 square feet.

When is the best time to treat my pond algae?

Pond algae should be treated when algae is actively growing and water temperatures are above 60F.

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Crystal Blue Plex Lake and Pond Algae Control

Crystal Blue Plex Lake and Pond Algae Control

Product ID: 636390950

Details

Brand
Crystal Blue
Liquid volume
128 Fluid
Item weight
9 Pounds
Item form
Copper Liquid
Manufacturer
Sanco

⏳Up to 30 days active control

🌊1 gallon treats 1 acre pond

💧Liquid copper sulfate formula

Description

💦 Clear waters, zero algae—own your pond’s glow-up!

EASY APPLICATION - Best applied with broadcast spray; treat in sections to maintain oxygen balance.
FISH SAFE FORMULA - Safe for most fish species—just avoid Koi, Goldfish, and Trout ponds.
EFFICIENT COVERAGE - One gallon treats a full acre pond, 1 to 3 feet deep—max impact, minimal effort.
LONG LASTING ACTION - Keeps your pond pristine for up to 30 days with a single application.
POWERFUL ALGAE ELIMINATOR - Targets and eradicates multiple algae types for crystal-clear water.

Crystal Blue Plex Lake and Pond Algae Control is a liquid copper sulfate solution designed to eliminate various algae types effectively. It remains active for up to 30 days, with one gallon treating a 1-acre pond between 1 and 3 feet deep. Safe for most fish species except Koi, Goldfish, and Trout, it requires careful application to avoid oxygen depletion, making it the go-to choice for maintaining vibrant, algae-free ponds.

Specifications

ASIN	B000IOBRBY
Brand	Crystal Blue
Brand Name	Crystal Blue
Customer Reviews	4.0 out of 5 stars 856 Reviews
Global Trade Identification Number	00768980004448
Item Form	Copper,Liquid
Item Weight	4.08 kg
Item form	Copper,Liquid
Item height	12 inches
Item weight	4.08 kg
Liquid Volume	128 Fluid Ounces
Liquid volume	128 Fluid Ounces
Manufacturer	Sanco
Target Species	Fish
UPC	768980004448

Reviews

G**5

Tough on Planktonic Algae

18.08.2025

P**N

West gloves and don't use if the wind is blowing.

21.10.2025

S**K

Summertime fun on Bickford pond.

6.08.2025

S**S

Minimal results and some of the worst and contradictory instructions I've ever seen.

13.07.2025

J**N

WOWWW!

24.09.2023

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