Yeah, it just copper sulfate and is just an algaecide. By calling it a liquid 'ionizer' they can charge more for it than for copper algaecide most likely
YOU DON'T WANT COPPER IN YOUR WATER! PERIOD! (And it really doesn't matter if the copper got there from an ionizer, a bottle of algaecide, a 'liquid ionizer", or throwing a whole bunch of pennies in your pool!)
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