| http://www.w3.org/ns/prov#value | - tals such as lead, copper, aluminum, and water hardness (pH) In Stage 4 water passes through a combination of KDF 55 and KDF 85 to reduce iron, mercury, copper, nickel, chromium, cadmium, aluminum, lead, other dissolved metals and hydrogen sulfide, and prevents growth of bacteria, algae, fungi, scale, and other microorganisms.
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