Having a coral (saltwater) tank, I wondered, too. Since I didn't know what interactions a marine additive would have on terrestrial micronutes, soils and ferts, I figured I'd better stick with traditional methods. (too broke to be overly-creative, lol)
When I lived in Vegas, the municipal water smelled strongly of chlorine. Filling a 5 gallon bucket with the water, and letting it set uncovered for a day, the chlorine smell disappeared. (isn't chlorine in muni. water supply a gas?)
HTH
Also, adjusting local water to use on plants, both outdoors and houseplants, is common. Shouldn't raise suspicions at all.