what about the chlorine in the water?
i don't just sit them under the shower and let it rain on them... though i've thought about that (but yeah, the chlorine wouldn't be good)
i always collect 3 gallons of water in a big thing... then put an airstone at the bottom and bubble it for about 24 hours, then add nutes and whatever other additives i'm doing into it and bubble it for another day or so (i grow organic, so i make teas and let them bubble together for a while...) then i water my plants... refill the container, and start the whole process over again...