I've used tap water for 5+ years with no issue, but in Montreal we have pretty good tap water quality
Is it a fish only tank?
Both... a 180 gallon FOWLR..I've used tap water for 5+ years with no issue, but in Montreal we have pretty good tap water quality
Is it a fish only tank?
90 Gallon with soft corals
2.5 pico tank loaded with soft corals
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The Kordon product might bind metals more tightly and permanently. They don't give enough details to judge. I'm not sure I'd worry enough to use it, but there's no reason not to give it a try.
I rely on filtered water from the grocery store. It undergoes reverse osmosis, uv treatment, and several passes through carbon filters. $0.25 per gallon.