"My neighbor tried it once and gave up after a couple weeks because he didn't see immediate results—ended up paying big bucks for a plumber instead."
That's pretty common, actually. Enzyme treatments can definitely work, but they're not magic bullets. Curious though, have you ever had your line scoped to check the severity of the root intrusion? Might save some headaches down the road...
Had the same issue at my parents' place a couple years back—enzyme treatments helped a bit, but honestly it wasn't a long-term fix. We eventually had the line scoped and found some pretty nasty root intrusion. Ended up getting it hydro-jetted, which cleared things right up. Not cheap, but beats dealing with backups every few months...might be worth looking into before things get worse.
Yeah, root intrusion's a sneaky one... enzymes can buy you some time, but they're kind of a band-aid fix. Getting a camera down there is smart—better to catch things early before you're ankle-deep in trouble. Hydro-jetting usually works wonders, just make sure whoever does it knows their stuff... seen some messy DIY attempts go sideways.
Had a similar issue at my place last spring—roots got into the main line and it was a total headache. Enzymes helped for a bit, but like you said, they're temporary at best. Hydro-jetting did the trick eventually, but I gotta ask: have you checked if there's a cracked pipe or joint letting those roots in? Might be worth looking into, because otherwise you're just treating symptoms, not the cause...
Had the same battle a couple years ago—felt like Groundhog Day every time it rained. Hydro-jetting was a lifesaver, but eventually had to bite the bullet and replace a cracked section. Not fun on the wallet, but hey, cheaper than building an indoor swimming pool...