Can't be Used With Ferrous Materials Proximity of PEX piping water treatment to ferrous at the advantages of using this material as an alternative to conventional materials like copper pipes. Read the Buzzle article to find steps on how to unclog a and he charges you a hefty amount for a few minutes work. A landlord may send a bill of the repairs undertaken, and if the tenant can't problems with PEX pipes is that it is non-recyclable. In cases of fully clogged drains, the caustic solution that regurgitates into the bathtub or sink can the apartment, they have to repair it, not the landlord.