I've bee thinking about starting a company where I fish roots out of your sewer and identify the plant (by sequence if necessary) that you have to kill so your sewer doesn't collapse as soon as it otherwise would.
$100 to stave off that $10000 sewer replacement for a few years would be worth it to a lot of people
Hard to get a plumber to knock on my door for under $100. Maybe you mean $500? Or is it $100 for the lab bit only?
Do it!
That’s a really clever idea, I would definitely pay for that in the right circumstances.
Now that I think about it - could you just pour some sort of biodegradable broad-spectrum herbicide down the drain to get the same effect for cheaper?