Patent ID: 6971125

Claim:
A method of making a fill and drain whirlpool bathtub having a tub, a closed loop plumbing system, an inlet pipe, an outlet pipe, a wall fitting and a water pump, the method comprising the steps of: providing the tub having a sloped sidewall; providing the inlet pipe made of a material having an antimicrobial therein; providing the outlet pipe made of a material having an antimicrobial therein; providing the wall fitting made of a material having an antimicrobial therein; providing the water pump made of a material having an antimicrobial therein; assembling the tub, the inlet pipe, the outlet pipe, the wall fitting, and the water pump to form the closed loop plumbing system for water flow; and wherein the antimicrobial is of sufficient concentration and type to provide for bacteria reduction in the closed loop plumbing system where the bacteria contacts the antimicrobial, after tub drain down and between electrical system activation.