Abstract: A feeder device for introducing treatment chemicals into a recirculating water stream from a swimming pool. The feeder device includes a housing having a top and bottom portions. A funnel-like hopper having sidewalls and an open bottom forms the inside of the top portion. A grid at least partially closes the open bottom of the hopper. The grid includes a top surface and a bottom surface. One or more chemicals such as chlorine are contained within the sidewalls of the hopper and supported by the top surface of the grid. A dissolving cup having a bottom surface and sidewalls is positioned within the bottom portion. The sidewalls include an opening or notch of a predetermined cross-sectional area formed therein. The bottom surface includes a center nozzle oriented vertically toward the bottom surface of the grid and an off-center nozzle adapted to direct the fluid horizontally in the dissolving cup.

Abstract: A feeder that uses a local elevation or stationary wave of a body of water to facilitate the dissolving of a chlorine-containing water treatment chemical.

Abstract: A feeder uses vortex flow to facilitate the dissolving of a chlorine-containing water treatment chemical. A feeder inlet receives water which is directed to a chamber by a conduit. A vortex flow in the chamber receives amounts of the chemical from a reservoir. Chlorine-containing water exits through an outlet.

Abstract: A feeder uses vortex flow to facilitate the dissolving of a chlorine-containing water treatment chemical. A feeder inlet receives water which is directed to a chamber by a conduit. A vortex flow in the chamber receives amounts of the chemical from a reservoir. Chlorine-containing water exits through an outlet.

Abstract: A hydroponic device includes a hollow housing which defines a substantially closed lower chamber for receiving a liquid nutrient solution and a top open-ended upper chamber for receiving an inert filler material and the desired vegetation which are separated by a partition wall. At least one nutrient supply pipe is coupled to the partition wall and extends downwardly into the lower chamber. The supply pipe has a throughput bore extending therethrough to establish fluid communication between the upper chamber and the lower chamber, whereby the nutrient solution may be fed in a continuous cycle from the lower chamber to the upper chamber and back again.