[eks391]

This is precisely what I do each year with a product designed for this exact purpose. $8+shipping gets me enough for my annual pipe maintenance. It's even the special kind because I have clay pipes.

I don't wasn't to kill parents idea. It's neat, and Im sure there's use cases that my solution doesn't meet

[Lvl999Noob]

Isn't this a problematic idea? If you flush down herbicide without checking the results, you would risk breeding herbicide resistance in the weeds.

[__MatrixMan__]

I hope yours keeps working for you. I flushed a lot of blue crystals, but the plant was not deterred.