摘要 |
A well-cleaning system ( 10 ) is provided with a control system ( 30 ) where waste liquid level sensors ( 35, 36 ) co-operate with timers ( 39, 40 ) to control the frequency and duration of the well-cleaning cycles. Chemicals can be injected into the water on demand from a well-conditioning sensor ( 38 ); and the well-cleaning system ( 10 ) can be operated when high H<SUB>2</SUB>S gas levels are detected in the well ( 20 ) by a H<SUB>2</SUB>S gas sensor ( 37 ).
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