Tommy Mac Discussions › Forums › Fix-it Forum: Home Improvement & Do It Yourself Repair Forum › Polybutylene Pipes › First check your toilets
Toilets are among the biggest culprits here.
Often a toilet will run silently and slowly without being detected. To find out if you have a problem, put a few drops of food coloring in the tank. Wait 10 minutes. If any of the color leaches into the bowl, you have a leaking toilet. Usually it can be fixed with a new flapper or new fill valve.