Re: Rat Patrol
I suspect this "system" was used on the city septic lines in the street? Yunno - downstream of the traps (water seal) applied to each septic connection in the living space?
Which might be possible. Kill the rodents with carbon monoxide, the excess goes out the top of each septic "stack" - and the building occupants are safe if they didn't smell "sewer gas" before the treatment.
A little "close to the edge" - but likely worked well.
Joe K
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Shudda kept the horse.
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