End of life indicator for automatic toilet cleaning devices

Details End of life indicator for automatic toilet cleaning devices End of life indicator for automatic toilet cleaning devices

1986-07-21

1989-01-24

Richman, Barry S.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Calorimeter

422 58, 422119, G01N 3122

Patent

active

048000663

ABSTRACT:
An end of life indicator for use in a toilet cistern with an ambient solution containing an active disinfectant component. The end of life indicator comprises a core of water soluble dyestuff surrounded by a polymer resistant to bleaching by said disinfectant solution. Upon the depletion of the active disinfectant component surrounding the end of life indicator, the alkalinity of the solution increases to a predetermined level whereupon hydrolysis of the polymer coating continues until water penetrates or dissolves the coating sufficiently to come into contact with the water soluble dye.

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