Open clogged drains

Our 50-year-old grease-encrusted drain pipes kept getting clogged, and lye-based drain openers weren’t helping. Even frequent plumber visits weren’t fixing the problem. In desperation, I bought this 25-pound pail of powder called Green Gobbler. I poured a few cups down a clean-out drain with a bit of hot water. It started bubbling and our house soon smelled like rotten eggs (this is apparently normal when using this stuff). It worked — no more slow draining sinks. Much cheaper and more effective than a plumber! — MF