Patent ID: 7146659

Claim:
A fill and drain whirlpool bathtub, comprising: a tub having hydro massage water jets; an inlet water pipe; a water outlet pipe; a plurality of wall fittings for water flow; an air volume control; an air pipe for air flow; and a water pump; wherein the inlet water pipe and the air pipe are made of plastic; wherein the inlet water pipe is canted downward at over a four-degree angle from the water pump to one of the plurality of wall fittings for water flow; wherein the inlet water pipe is adhesively secured to a separate elbow fitting to form a water tight seal between the inlet water pipe and the separate elbow fitting; wherein the inlet water pipe, the outlet water pipe, at least one of the plurality of wall fittings for water flow, the air pipe, and the water pump are impregnated with 0.001 percent to fifteen percent by weight of a substantially non-leaching bacteriostatic antimicrobial; wherein a threshold of released antimicrobial is no greater than 1 part per million; wherein the substantially non-leaching bacteriostatic antimicrobial provides for over a seventy-five percent reduction of grain-negative bacteria over a period of time between tub drain down and electrical system activation; and wherein the substantially non-leaching bacteriostatic antimicrobial inhibits biofilm growth.