Is copper 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, Copper sulfate is not meant for small deco ponds and is toxic to Koi, Golfish and Trout.

How often should I use Copper Sulfate?

Copper sulfate 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 casting granulars, dragging behind boat in burlap, or dissolve and spray.

How much product do I use?

1.8 lbs of copper will treat up to 15,000 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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💧 Clear waters, zero algae—own your pond’s glow-up!

AQUATIC GRADE PURITY - Imported 99% pure copper sulfate ensures maximum effectiveness
PROVEN POND PROTECTOR - Ideal for thick floating algae mats, keeping your aquatic space pristine
EFFORTLESS APPLICATION - Easy-to-cast granular formula melts quickly for immediate action
PRECISION ALGAE CONTROL - Targets and repels most algae types with surgical accuracy
TEMPERATURE ACTIVATED POWER - Works best in water temperatures above 60°F for rapid results

Crystal Blue Copper Sulfate Algaecide is a premium 5 lb granular treatment featuring 99% pure copper sulfate designed for professional-grade algae control in ponds. Best applied in waters above 60°F, it rapidly targets and repels most algae types, especially effective on dense floating mats, ensuring crystal-clear aquatic environments with minimal effort.

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