| 摘要 |
<p>A spa includes a housing forming a vessel, an opening formed in the vessel, a valve fluidly coupled to the opening, a liquid sensor configured to measure an amount of liquid in the vessel, and a controller operatively connected to the valve and the liquid sensor. The controller operates the valve to drain liquid the vessel through the opening, and operates the valve to fill the vessel with liquid from a liquid source when a predetermined amount of liquid has drained from the vessel.</p> |
