Abstract: An automatic swimming pool chemical feeder designed to operate on the pressure side of the filter system and which combines two independent feeding compartments is provided. A first compartment contains, for dispensing, a solid material such as water soluble chlorine tablets which erode by water flow in contact therewith and the second compartment contains a liquid also to be dispensed. Material from both compartments is dispensed as a liquid. The solid material is liquified by introducing a dissolving liquid such as water into the first compartment to dissolve at least the lower part of the solid material. The apparatus is connected in the line of a flowing liquid stream such as a swimming pool recirculation system. Liquid from both compartments is dispensed as desired in predetermined quantities from the bottom of each compartment into the pressure side of a line carrying the flowing stream into which the apparatus is connected.

Abstract: A swimming pool cleaning apparatus is disclosed which includes a drive head that is continuously biased towards the side wall of the swimming pool by a pair of water jets located on a manifold rotatably mounted on a buoyant portion of the head. The jets are arranged to produce a resultant propulsion force extending through the mounting axis of the manifold on the buoyant head, in order to propel the head towards and along the wall of the pool. When the head engages an obstacle or side wall its forward movement is stopped and the force acting on the manifold causes the manifold to rotate and redirect the resultant force, thereby changing the direction of movement of the head so that it can pass around the obstacle or turn at a corner of the pool.