the last point where the sewer exits the house? It is probably not because of your new low gallonage toilet. and most certainly due to an obstruction still in you main sewer line. where is your sewer line cleanout point located with respect to this bathroom? and where did you run a snake from and to? give us more info. so we can offer additional help. when the backup cccurs does it eventually, slowly drain completely? or does the bathroom stay stopped up? LJ
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