We recently remodeled our kitchen new dishwasher, sink and garbage disposal. The dishwasher backflows into the sink and now the sink doesn't drain properly very slow. I don't think its a clog because in my house if the sinks cloged so is the washing machine drain and its fine. I also recently had the drain cleaned. I try to run the garbage disposal and it seems to grind fine but won't pull the water down. help...