Washable AC Filters are just as safe as traditional air filters. Where the debate gets interesting is after you wash the washable filter. If the washable filter is not cleaned properly, over time you may see a decrease in efficiency of the washable filter.
The upside to Washable AC Filters though is that you reduce the amount of filters that are disposed and enter into landfills. Not to mention that you don’t need to remember to go to the store and pick up a new one after you run out. Sold on washable air filters? I wrote an article on the best washable ac filters so you can review them and find one for yourself.