I get what you mean about being cautious with root killers. I’ve read a bunch of mixed stuff about them, especially when you’re dealing with greywater setups. Some folks say the chemicals break down fast, but I’m not convinced they don’t linger and mess with the good bacteria. I’ve noticed a weird, almost sour smell in the soil after using copper sulfate once—could’ve been my imagination, but it was enough to make me stop.
About the root barrier, I tried something similar with old vinyl siding scraps. It slowed the roots down for a bit, but those maples are relentless. I wonder if the extra moisture from rainwater systems just makes it too tempting for them. Have you checked if your joints are leaking more than you think? Sometimes it’s just a slow drip, but that’s all it takes for roots to find their way in.
I’m also a little skeptical about using any kind of chemical near pipes that carry water we’re trying to reuse. Even if it doesn’t kill all the microbes, I’d rather not risk it. I’ve been looking into those physical root barriers you can buy, but they’re not cheap. Still, maybe worth it in the long run if it keeps the roots out and the system working.
One thing I haven’t tried is planting something that competes with the maple roots, like a dense groundcover. Not sure if it would actually help, but maybe it’d at least slow them down. Anyone else tried that? Or maybe I’m just overthinking it... but I’d rather be safe than sorry when it comes to water systems and soil health.
I get the hesitation with chemicals, but I’ve actually seen copper sulfate work pretty well in older clay pipes—never had lingering smells or issues with soil health, at least in my experience. Sometimes I think the key is just using the right amount and not overdoing it. Physical barriers are solid, but yeah, they’re pricey and not always foolproof either. As for groundcover, I’ve tried vinca minor around some lines and honestly, those maple roots still found a way through. Roots are stubborn, no matter what you throw at them...
