root control in toilet drains
OK, let's talk about root control in toilet drains. Rock salt? Copper sulfate? (In fact, I think my city bans the latter now, so that's not an option.)
If rock salt, which is cheap, how to do it? Dump crystals in toilet and flush? Make a saturated solution and flush? How much, how often?
If not rock salt, what else works that is permitted? What exactly is this "foaming root killer" stuff? Pricey, but if it works ...