Apparatus and instruments for use in the purification, separation and sterilization of liquids and gases used in the biotechnology, pharmaceutical, medical, biopharmaceutical and food and beverage industries; Apparatus for filtering drinking water; Electrolytic water generators for electrically decomposing tap water to generate electrolytic water and for removing chlorine odor from tap water; External filtering device for use in a local containment area for removing oil and other contaminants...