Product review (5 stars): Adding a cap full of BestAir Bacteriostatic Algae & Order Treatment works great to make sure the filter does not mildew
. The person giving the tip about flipping the filter, to save on the filter life is quite correct. Thanks you.  I flip it a least twice a week, since the part on top drys out if you don't.  Adding a cap full of BestAir Bacteriostatic Algae & Order Treatment works great to make sure the filter does not mildew.  And forget about the guy that acted like this stuff was so poisonous that he would not have it around animals.  It is not different than bleach or antifreeze. Sure you should not let animals get in to it, but diluted ( a cap full in a gallon and half) cannot hurt anyone or anything,.  And yes you do not put your nose over top a bottle of beach to ammonia  either,  That can vapor lock your lungs. Same warning on the label.  So perfect safe if you treat it like bleach and ammonia, out of the reach of kids as many products should be.  So don't think that it going to be quiet and you would be real happy with this unit.