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Our corporation cleans the stacks every couple of years, from the kitchen sinks to the stack (with a power auger) and finally from the bottom of the stack upwards to ensure everything has been cleared out. It costs the corporation money, but it is cheaper than increased insurance claims, whether by the corporation or an individual. The garden hose from the top issue is averted!
Our kitchen waste pipes are 2000 vintage plastic, connecting to a 1979 vintage cast iron stack. In some cases, the power auger ‘cleans’ from one kitchen across to the neighbour’s sink. The last time he was here, the plumber told me the best plastic pipe cleaning tool is hot water and concentrated ordinary dishwashing fluid – don’t use those strong chemicals from the grocery or hardware store!
