H2O Air Water Americas Electrostatic Air Filters create its own electrostatic charge so it does not add to your electrical cost, but aids in reducing costs by keeping your air conditioning/ Heating Coils and Equipment cleaner, so they operate at the highest capacity possible.Permanent washable electrostatic air filters are designed with a Heavy Duty Aluminum Frame, 2 Layers of special Polypropylene Weave on the front and back, with a unique poly internal lining designed for years of filtration.