I need some advise on my sewer systems. I thought the sewer pipe might of been clogged but after running a snake through the canal I found that it might be a venting problem. It is possible that ice has formed in there. This may be true since I live in NW Colorado, lots of snow still and temp at time in the 10's. How would I break up that ice. I am thinking of dropping those salt tablets in the pipe to break up the ice. What's you advise?