Using too much powder without enough liquid can actually cause the soda to settle and harden into a solid mass , making a blockage worse.
If you have very old, fragile metal pipes, use hot tap water instead of boiling water to avoid the risk of thermal shock or pressure damage from the gas buildup. The Verdict bicarbonate of soda drain cleaner
Let it sit for 15–30 minutes. Finish by flushing the drain again with another round of boiling water to wash away the loosened gunk. When to Call in the Pros Using too much powder without enough liquid can