I have 5 toliets,5 sinks,1 urinal which all dump into a 4" main sewer.Now we have been recently having problems with the drain backing up.We have had it cameraed but really could not find any signifient problem.MY boss wants to remove the 4" cast iron and replace it with 6" pvc.Now I do not agree with this b/c we are dealing with 1.6gpf toilets.Take in mind this is a libary on a college campus.There is 2 braches one which has 3 toliets,3 sinks and the other which wyes into the 1st one which has 2 toliets,2 sinks, 1urinal.
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Which size should I go with?????Page Title Module
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