I have several 3 gallon tupperware tubs set up outside to catch rainwater as it's been storming like crazy here in Buffalo and I've been spending a small fortune on distilled water. I went out to collect full tubs this evening and noticed that all the water has a brownish-yellow tint. Is this algae starting up? Is this OK water to use for my CPs? Or did some kids just pee in my rainwater? (j/k but I figure I'd post the comment before anyone else got to it)...