Hey String, here's a rule of thumb you might use: IF you can drink the water from your tap, and it's not killing your lawn, it's probably just fine for your girls. Most American communities don't have the horrible "over clorination" problem of years ago. Think of all the large cities that have botanical gardens. Those fancy hybrid Tea Roses are getting plain ol' "Tappa Pura" for sure and surviving just fine. A lot of folks get a little over protective, and if they want feed their girls Perrier by the gallon, I say go ahead, it sure can't hurt. Good luck & good grow.......BB