The washing machine in my garage goes into a 2" abs line down to a p trap and then a T no hubbed into 2" galvanized drain with about 15 ft. horizontal run into the main drain line the top of the T reduces to a 1 1/2" galv. vent line which runs through the roof. The 2" drain line also services the kitchen sink and dishwasher which have another 1 1/2" vent. The washer drain has been overflowing lately. I have tried using a manual snake to clear the line as well as one of those gizmos you attach to a hose and it supposedly pulsates jets of water to clear the line. It seems to help for a week or two but then the problem begins again. I am not sure what more to do? Should I upsize the vent line to a 2"? Should I rent a power auger and run it through the line or should I seperate the 2 drains? Or?????? Please help
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