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Your cart is empty.This concentrated granular is specially formulated to protect pool surfaces from minerals in the water and is ideal for use with hard water. It is also great for pool openings or when adding make-up water.
Hyung H Kim
Reviewed in the United States on March 27, 2025
Seems to work a bit better than other brands for the metal stains in our pool. The price is reasonable and giving it a 4 star. I would have given 5 if its efficacy is a bit longer - don't forget to add a smaller amount every week or so to control the metal stain. I complemet this with ascorbic acid time-to-time.
fred r
Reviewed in the United States on October 24, 2024
Scaling is staying off since regular use
road_warrior
Reviewed in the United States on December 7, 2019
I love GLB chemicals quality and results. Returned to using GLB from trying to save $, and found GLB has best predictable results. GLB chemicals fan.
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