Metamucil got dump down our sink. We tried flushing it with hot water, baking & Vinegar, liquid plummer and were currently snaking it, which is a slow process. Is there anything else we can use to break it up.

Where's the location of the clog? The trap? In the wall somewhere?
Metamucil will clog pipes? What's it do to your pipes when you take it? Back to you, Tom