"We had a drain at a mop sink that has been plugged up for years. A few years ago the drain cover disappeared and allow rags to go down the drain. After the main waste line was commercially jetted after the grease trap was cleaned, this sink still did not clear. A manual snake cleaned the rag issue and a power snake could not break the clog.
Four months later I read about Clog Hog on a plumbing forum. I already had a commercial grade pressure washer and this looked perfect for the job. I was pleasantly surprised how thin the hose was and as advertised a small jet nozzle. The trap was fairly deep under a slab and took a while for the hose to make the bend. A coworker fashioned a 3/4 PRV pipe and with some heat curved the end to make a small j. This worked and allow the hog to work through the trap a little easier. It also allowed to push the hose down a bit without it wanting to crimp.
It took a few hours to clear this very stubborn block. The sink would fill with water and we had to use pails to dump water or wait for it to drain a bit. I was able to feel when the jet hit the block because a little push on the hose would not allow it go forward bet the jets. Sometimes I ran the pressure washer for ten minutes as I knew it was cutting into the block. Finally it broke through, ten feet from the drain and we figured it was at the wye to the main drain pipe. Working it back and forth several times the clog loosened and we caught it at a clean out. It was very old soap and grease that solidified like concrete.
A lot a people are happy and saved the church about $500 for a plumber to try it.
A worth while tool and now my son has a under ground drain line for drainage of his pool deck that needs cleaning. This is the tool to use. A great product. "