Septic tanks

Details Septic tanks Septic tanks

2007-02-06

2010-06-08

Smith, Duane (Department: 1797)

Liquid purification or separation

Processes

Including controlling process in response to a sensed condition

C210S747300

Reexamination Certificate

active

07731855

ABSTRACT:
A method of determining whether a septic tank containing a liquid and sludge or scum mixture needs to be emptied, comprising locating a sensor in the mixture wherein the sensor is adapted to measure a parameter which can be used to determining the depth of sludge or scum in the septic tank and generating a warning signal when a signal from the sensor is indicative of a depth of sludge or scum exceeding a predetermined limit.

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