Crystal Blue Copper Sulfate Algaecide – Granular Aquatic Grade Copper Sulfate for Pond Algae Control – 5 Pounds
$31.99
Price: $31.99
(as of Nov 01, 2025 03:21:28 UTC – Details)
From the brand
Clean, Clear and Crystal Blue
We offer a complete line of pond maintenance products that will solve almost any pond problem you might have. We believe our products are great and we love empowering end users with the knowledge to successfully transform their bodies of water.
How did we get our start?
Our business began in 1991. Our initial products were developed in kitchen sinks, marketed, sold & delivered from cars. By 1994 the company was incorporated. A warehouse in downtown Fort Wayne replaced a garage and the company hired its first employees.
What makes our products unique?
Our focus on marketing products to the end user is what makes us unique. This gives customers the confidence to treat.
Why do we love what we do?
We love helping pond owners transform their unusable bodies of water into a beautiful retreat worthy landscapes.
Variety
99% Copper Sulfate Pentahydrate. To be used for large bodies of water, not small decorative ponds, water features, or pools.
Controls most species of algae like filamentous, string algae and swimmers itch. Copper Sulfate should be used as a pond algae treatment on actively growing algae in water temperature above 60F.
Most effective when cast out on top of thick floating algae mats. Be aware of how much vegetation you are treating at one time. Eliminating too much at once can deplete the oxygen levels too quickly for your fish.
Granular Copper Sulfate, 5 lbs
DO NOT use in bodies of water that include Koi, Goldfish, Trout, or Grass Carp. These types of fish are sensitive to copper sulfate products.
Customers say
Customers find the copper sulfate algaecide effective at preventing and removing algae, with one noting it works within 24 hours. Moreover, the product receives positive feedback for its quality and value, being economical for pool maintenance. Additionally, they appreciate its ease of use, clear water results, and safety for fish. However, opinions about safety are mixed, with some finding it hazardous while others say it’s safe for fish. The amount of product is also a concern for some customers.
8 reviews for Crystal Blue Copper Sulfate Algaecide – Granular Aquatic Grade Copper Sulfate for Pond Algae Control – 5 Pounds
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mike anspach –
This is a great product !
I have a 400 gallon pond with a waterfall and I always had an algae issue until I bought this. I know I poured a little too much in but I was thinking “what the heck”. The pond was cloudy for a few days and then it cleared the water up and now it looks fantastic! Crystal clear. What a great product ! I would highly recommend this to anyone who has a pond with an algae problem !!!
Wendy Foye –
Great
Works wonders
susan –
Weed killer
This product really works for my pipes….
Sharla Beth Jackson –
Works as it should
Good stuff but hard to determine how much to use. Sprinkling uses too much but you can dissolve in water and spray
Ada B. –
Crystal Blue Copper Sulfate
It works great. I do recommend
Patriot –
Toxic to humans
Works with constant application, that being said, very expensiveMake sure you don’t touch or breath product.
T. Manning –
Best product I have ever used to control algae.
I have a small garden pond (approximately. 450 gals.) with some lilies. No Fish. I have constantly battled withalgae and green water every summer. I have tried many different products without success. This is the ONLYproduct that has worked for me. I used 1 Tablespoon diluted in 16 oz. of water. It does not seem to be harmfulto the lilies at this time. I wish I had known about this product when I built my pond several years ago.
craig hardbarger –
Copper sulfate pellets
Worked well for me. Follow instructions do not overuse.