I have went WAY overboard on brewing and have at times ( including bottle conditioning) 7-8-9 batches going. I put 4 swamp coolers in my bedroom ( wife is very accomodating to my hobbies) and just kept switching brews in and out. The past two weeks my wife and I have been having sinus and respiratory issues and the swamp coolers never crossed my mind. we had been gone all day yesterday and the bedroom was closed up. She opened the bedroom door and the stagnant moldy water smell was overwhelming. I guess we were like the people whose house smells like cat piss that don't notice it because they have grown accustomed to it. Anyway pulled the brews out and dumped the swamp coolers last night. The crud in the bottom of them was gross and STUNK. SOOOO if you have a swamp cooler or coolers, PUT BLEACH IN THE WATER.