Eeew! Gnats coming from black tank??

Lantley wrote:

westend wrote:
I wouldn't think a whole can of insecticide is necessary. A couple of small bursts of spray in my garage kills everything. The black tank is very small, in comparison. If it was me, I'd throw a cup of diluted bleach in the drained tank and not use the toilet for a couple of hours.

These are not gnats. Sewer flies are very determined. They thrive in sewers! A couple of squirts won't do it. The idea is to fumigate/engulf the whole tank including the piping and crevices of the toilet.
Use the whole can,there's no need to save any.

I still don't get it but I've never had to kill these kinds of bugs and I could really care less. I do have an issue with the way some folks deal with pesticides, though. It goes back to my Master Gardener days, dealing with the public, and my feelings about indiscriminate use of pesticides, I think we have enough poison around us.

It just occured to me that using an airborne insect killer in the volume of a waste tank wouldn't require a whole can of spray. If everyone's certain that the ingredients will kill the larva, the eggs, and the flies, that the whole can is necessary to reach the effective rate, have at it.

I've seen on this Forum, the advocacy of cutting up pet flea collars to eliminate insects and placing them around the furnace or water heater. If folks knew what kinds of neuro-toxins they were experimenting with and the release rate from cutting, they might think twice about even touching one of these.