Every so often, clean the containers that you store the water in, We use the 5 gal jugs you get for your own drinking water (if you buy bottled water)... Basically just disinfect them with a tablespoon or so of bleach in warm water, shake to get the solution all over the inside of the bottle, let sit for a bit to disinfect, rinse well and if you want after the rinse out, fill it up and add a bit of chlorine neutralizer to the bottle, let it sit overnight, rinse again in the am and you should be good to go for awhile...it may seem like overkill just passing on $.02 worth of knowledge