A siphon dosing system comprising:
- (a) an upper barrel sealed at the base to a circular chamber partition and having a cover defining an upper chamber therein, said chamber partition having at least one flow passage and a plurality of upper chamber drain passages extending vertically therethrough to drain said upper chamber;
- (b) an upper float in said upper chamber which, at rest, seals said at least one flow passage;
- (c) a lower float beneath said chamber partition and suspended centrally therefrom by a retainer stem, said retainer stem having a shaft which slides vertically within an opening in the center of said chamber partition but is prevented from dropping through by an upper lip thereon;
- (d) wherein said lower float, when buoyant, rises to seal said plurality of upper chamber drain passages, thereby blocking liquid flow into said upper chamber from below;
- (e) a vertical central tube sealed at its base centrally onto said chamber partition, surrounding the top of but not impairing the movement of, said retainer stem, said central tube extending upwards and sealed into said cover;
- (f) at least one spillover port in said central tube directly beneath the juncture of said central tube with said cover;
- (g) a metering orifice in said central tube above said at least one spillover port;
- (h) at least one radial passage within said cover passing from the top of an outer chamber to an opening above said metering orifice;
- (i) a cylindrical exterior housing concentric with and external to said barrel, sealed to said the outer perimeter of said chamber partition which extends outwardly beyond the base of said barrel, extending upwardly sealing to said cover, thereby defining said outer chamber above the chamber partition, and extending downwardly beneath said chamber partition, terminating at a diameter reducing flange;
- (j) an inlet conduit comprising tube sealed to said diameter reducing flange and embracing a fine mesh filter mounted thereon and thereby defining a lower chamber between said chamber partition and said fine mesh filter;
- (k) a siphon tube within said outer chamber, sealed onto said lower reducing flange and extending upward, through said chamber partition, through said cover, sealed thereto, and extending above said cover, terminating open to atmosphere above the cover, said siphon tube further having an opening near its base to allows air to flow into the lower chamber when said siphon tube is drained therebelow;
- (l) a plurality of flow passages between said outer chamber and said lower chamber through said chamber partition;
- and
- (m) an exit pipe with an initial uplift passing from said upper chamber, through said exterior housing, directed through a discharge elbow, into a discharge pan in a distribution box.