Abstract: An apparatus that permits fluid-isolation bathing whereby a bather can bathe in a relatively small volume of bathing fluid or liquid selected for special properties (e.g. cleansing or soaking). The bather is isolated from a larger surrounding volume of water by means of a thin-walled bag. The bather enters and exits the apparatus by means of a hydraulically actuated pistion-like platform that is fitted to a cylindrical bathing container filled with water. The hydraulic circulation of the water between top and bottom of the container is accomplished by a bather-controlled pump and valve mechanism. The invention provides sanitary bathing through the fluid-isolation of disposable thin-walled bathing bags. It also permits bathing the entire body surface in a small volume of bathing fluids that may be realatively costly.