Product review (1 stars): BEWARE: SMELLS STRONG OF CHLORINE/BLEACH, NOT SAFE FOR ALL MACHINES, POTENTIALLY DANGEROUS, POOR INTRUCTIONS
this stuff is basically BLEACH. the label is VERY VAGUE and the instructions and warnings were minimal but enough to make me wary before putting in my sons humidifier. the information i was looking for was "WHAT TYPE OF MACHINE, AND DO I PUT IN WHILE RUNNING IT?" NEITHER of which IS CLEAR on the label.  after determining that my humidifier was ok to put it in (it ultimately WAS NOT OK as i have an ultra sonic cool mist humidifier) i filled the gallon tank and dropped a cap load in. it REEKED OF CHLORINE/BLEACH. it smelled far too strong and i thought, "this cant be right." this cant be good to leave in while operating the machine. i stopped and looked for more info. BE VERY CAREFUL WHICH MACHINE YOU USE THIS IN. IT APPEARS ONLY SAFE FOR HOLMES brand MACHINES. regardless, the smell concerned me and the idea of putting the chemicals into the air to breathe led me to rinse out the tank and basically just use it as a cleaning agent. ONE STAR FOR VERY VAGUE LABELING/INSTRUCTIONS, DESPITE STRONG WARNINGS OF DANGEROUS CHEMICALS, very confusing.  I suppose this stuff does do its job when used properly but there's almost no way to know how to use it properly.  I fear for those that might assume and trust the product over their hesitation from confusion.