The ProOne® G3.0 series filter is the only gravity filter that bears the distinguished NSF/ANSI-42 component certification. Independently lab tested for performance in the reduction of over 200+ contaminants including heavy metals, fluoride, pesticides, herbicides, chlorine, chloramines, pharmaceuticals and more! Ideal for use with most natural potable water sources. Available in 4 sizes to fit most other gravity filtration systems. Advanced features of the ProOne® G3.0 series filter include: -“All-in-one” filter technology. NO add-on filter required for fluoride reduction – Infused bacteriostatic outer ceramic shell and proprietary carbon-based granular media inside the core of the filter. -No priming required -Cleanable, reusable, can be stored in a cool dry place when not in use -Does not need to be kept saturated when not in use -Available in 4 sizes, 4”, 5”, 7” and 9” tall by 2.75” diameter -Improved flow rates -May contain coconut Tested by a certified independent lab to NSF/ANSI Standards 42, 53, P231, P401 and P473. Please visit our lab reports for complete details. ProOne G3.0 Ceramic Gravity Countertop Water Filters are NSF/ANSI-42 Component Certified! ProOne® Water Filters offers affordable water filtration systems to help improve the quality of your water. Dedication to innovation, extensive testing, and exceptional customer service is our commitment to you!