Abstract: An apparatus is provided on a contaminated water source that readily effects chemical purification of the water by providing an automatic means of manufacturing a stock solution of chemicals, storing the stock solution, and then injecting the solution into the line. The injector is set to operate at peak efficiency, and accuracy is obtained by controlling the strength of the stock solution. A relatively small amount of water is chemically treated and then is mixed with a large quantity of contaminated water.

Abstract: An apparatus for feeding substantially uniform amounts of a chemical into a liquid stream having an irregular flow pattern. In accordance with an embodiment of the present invention there is provided a holding tank having an inlet port for receiving a liquid stream, such as the effluent of a septic system. The tank has an aperture located at a relatively high position in a side wall thereof. A siphon means is provided and comprises an inverted U-shaped section of pipe passing through the aperture and having an inner leg which extends to a position near the bottom of the tank. The siphon means also has an outer leg which extends to a position substantially below the bottom of the tank. Chemical feeding means, preferably in the form of an erosion feeder, are coupled to the outer pipe leg of the siphon means. The feeding means contains a supply of the chemical additive and is operative to feed the chemical into the liquid discharged from the outer leg.