Yeah good old off the shelf eighty-nine cents a gallon generic bleach! My rule of thumb with it (at the correctly diluted levels) is twenty-four hours. It gets a pretty bad rap but the stuff is really useful and rather benign because of it's rapid evaporation. I avoid creating any grey water by using it for hand washing, bathing and washing my clothes. Also when necessary treating water that I find to be suspect. I highly suggest reading up on it here: https://en.wikipedia.org/wiki/Sodium_hypochlorite Especially the 'Uses' section and 'Environmental impact' section.