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Knock out green pool water with Caribbean Blue Knock Out Algae Killer presented by Pool Stuff Express. Blue, green, purple, and mustard algae don't stand a chance when you put Caribbean Blue Knock Out Algae Killer in the pool. Simply shake, dilute, and pour into the water, the chelated copper ions will do the work. No staining or fussing.
- Kills most algae breeds
- Does not affect water balance
- Can be used with most sanitizers
For faster results use a wall brush to brush the entire floor and walls before putting Caribbean Blue Knock Out into the water and Caribbean Blue Forever Clear Clarifier after the water has been filtered to speed up the filtration of dead algae.
Michael P
Reviewed in the United States on September 19, 2024
This product cleaned up the algae in my pool in two days. I highly recommend it if you have that problem.
JudyN
Reviewed in the United States on November 5, 2017
As Fall advances the pool gets used less. Some algae was starting to grow, this solved that problem. The product is basically Copper sulfate.
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