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waste pipe connection for shower,sink & toliet I think its galvanized steel i've heard over time it will become clogged and need to be replaced, is this true? And if so is it a hard fix to replace with pvc piping ,I think of myself as handy
It will be cheaper & easier to buy a snake and clean your drains every few years than replacing the pipes. All pipes -- even PVC -- will get a build up on their horizontal runs over time, though PVC is less prone than galvanized or cast iron. The only reason that I would replace pipes is if they are leaking or have some other problem.