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Anyway, filters are necessary because we need to breath clean air. That is that reason why we need humidifier filters so that the rooms are dry and not moist because it promotes growth of fungus. Anyway, when you have a spa at home or when you own a spa business, it is very necessary that you get spa filters because their will always be vapors and you need to make sure that after its is used the air is clean and dry with no traces of germs left. So, if you have any need for any kind of air filters then you should visit this place called Yourfilters.com. I am sure you will like this place.