I had a serious clog in my bathtub and sink. I purchased both the Green Gobbler liquid and granules. I scooped out most of the backed-up water from the tub and poured the granules down the drain. It was difficult getting the granules down the sink, and so I used the liquid. I left them for about 4 hours; boiled about 2 gallons of water and slowly poured it down the sink and tub, then I followed this with more hot water from the pipes. Problem solved! I plan to use it every six months or so to keep the drains flushed. I'm very happy with the product. Using boiling water helped.
Bottom Line: Yes, I would recommend this to a friend