Scrubbing apparatus

A scrubbing apparatus comprising:

• a gas-exchange scrubbing column for removing extraneous gaseous matter from water;
• and flow control means comprising an upper reservoir mounted above said scrubbing column for receiving a supply of water to be passed through said column, controllable valve means for regulating the flow of water to said upper reservoir, level sensing means in said upper reservoir responsive to the level of water therein for producing predetermined control signals in a predetermined systematic fashion in accordance with said level, said controllable valve means being responsive to said predetermined control signal for regulating the flow of water to said upper reservoir, and adjustable orifice means intermediate said upper reservoir and said column for delivering water from said upper reservoir to said column;
• sthe level of water in said upper reservoir set by said level sensing means cooperating with said adjustable orifice means to control the rate flow of water to the scrubbing column therebelow;
• wherein said adjustable orifice means is interposed between said upper reservoir and said scrubbing column and is adjustable for adjusting the rate of flow of water from said upper reservoir to said column and includes adjustment means extending externally of said scrubbing apparatus.