Review on Poly Guard Crystal System: Cartridge and Housing for Reduced Copper and Lead in Drinking Water. Works with Whole-Home Filters, Prevents Scale, Corrosion, and Rust Stains by Kaveen Reyes
It's LIQUID, no crystals!
The entire product page is dedicated to crystals, which are mentioned dozens of times. Only one spot below the product page mentions liquid and then the description below refers to crystals. The liquid requires an injection system and does not work with the cartridge and filter housing.
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