Milwaukee MA887 Digital Salinity Refractometer with Hard Carrying Case for Refractometer 818201893259 The Gravity Water System uses

The Gravity Water System uses a comprehensive long-contact filtration process for superior purification:

reliable three-way connections in reverse osmosis (RO) systems

Designed and manufactured by John Guest Speedfit

Is this filter compatible with all Santevia Gravity Water Systems

Milwaukee MA887 Digital Salinity Refractometer with Hard Carrying Case for Refractometer 818201893259 The Gravity Water System usesThousands of saltwater aquarium enthusiasts have dialed in the analysis with Milwaukee's salinity refractometer. No more visual readings. Get a digital readout within seconds accurate to 2 ppt with automatic temperature compensation (ATC). WHAT PEOPLE ARE SAYING "This is a terrific addition and you'll want a digital refractometer if you spend any time at all with saltwater aquariums. Highly recommended." "This is a must for any even remotely serious