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An automatic demand chlorination system for use with a recirculation unit for a body of fluid, the body of fluid has a chemical therein. The automatic demand chlorination system comprises a chemical sensing unit for detecting the amount of the chemical and producing a signal, a chemical feed unit fo

An automatic demand chlorination system for use with a recirculation unit for a body of fluid, the body of fluid has a chemical therein. The automatic demand chlorination system comprises a chemical sensing unit for detecting the amount of the chemical and producing a signal, a chemical feed unit for feeding the chemical into the recirculation unit, an electronics unit for controlling the feeding of the chemical, and a solenoid unit for actuating the chemical feed unit. The electronics unit comprises input signal regulation means for receiving the signal of the sensing unit and generating a regulated signal; comparator means for comparing the regulated signal with a predetermined signal representative of the desired amount of the chemical in the recirculation unit and generating a chemical infeed signal; and solenoid timer means for receiving the chemical infeed signal and activating the solenoid unit.

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For use with a recirculation unit for a body of fluid, said body of fluid having a chemical therein, an automatic demand chlorination system, comprising a chemical sensing unit for detecting the amount of said chemical and producing a signal, wherein said chemical sensing unit is a liquidless, solid

For use with a recirculation unit for a body of fluid, said body of fluid having a chemical therein, an automatic demand chlorination system, comprising a chemical sensing unit for detecting the amount of said chemical and producing a signal, wherein said chemical sensing unit is a liquidless, solid state device; a chemical feed unit for feeding said chemical into said recirculation unit; an electronics unit for controlling said feeding of said chemical; and a solenoid unit for actuating said chemical feed unit, said electronics unit comprises input signal regulation means for receiving said signal of said chemical sensing unit and generating a regulated signal, wherein said input signal regulation means includes buffer means for receiving said chemical sensing unit signal and generating a signal representative of said chemical sensing unit signal, filter means for receiving said buffer means signal and generating a filtered signal, and amplifier means for receiving said filtered signal and generating said regulated signal; comparator means for comparing said regulated signal with a predetermined signal representative of the desired amount of said chemical in said recirculation unit and generating a chemical infeed signal; and solenoid timer means for receiving said chemical infeed signal and activating said solenoid unit.