There will be noticeable symptoms if your existing piping is failing. These can include low water pressure, visible water pooling on your floor, mold or mildew in strange places, discolored or bad-tasting water, scalding water in the shower when you run the sink or flush the toilet, You may also require repiping if you have Kitec piping installed, as this product has been recalled. Older homes with galvanized pipes may also be clogged with mineral residue some of the symptoms mentioned above.