Aquacera Pioneer SS Gravity Water Filter with 2 7 inch CeraMetix Filters For use on municipal or natural water sources Ideal for camping, emergency relief, everyday use Saves money over expensive bottled water Total capacity 4.5 US Gallons (2.5 upper & 2 lower chamber) The holes which are not in use are filled with removable rubber plugs (provided) for versatility Pathogenic bacteria&gt;99.9999% (ALcontrol Laboratories) Cholera, Typhoid, Salmonella, E. Coli, Fecal Coliform Cysts100% (ALcontrol Laboratories) Cryptosporidium Parvum, Giardia Lamblia Sediment100% absolute to 0.5 micron (IBR Laboratories) Chloramines&gt;99% Chlorine&gt;99% Lead&gt;99% Fluoride &gt;85% VOCVolatile Organic Compounds&gt;98% MetalsAluminum, Iron, Mercury, Nickel & Zinc&gt;98% MTBE&gt;97% Arsenic&gt;95& Glyphosate&gt;99.9% Pharmaceutical CompoundsAcetaminophen, Progesterone, Ibuprofen, Naproxen Sodium&gt;95% Herbicides&gt;99% Nitrates&gt;92%