If your toilet isn't flushing properly or the system has backed up, you can use a plunger to fix the problem. Please be very careful when dealing with a clogged toilet to ensure you don't cause the basin to overflow.
Sinks & Showers
If your sink or shower drain is draining slowly or stopped altogether, visit a hardware store near you. There are many plastic cleaning tools you can use to clean the pipes; you can also use liquid plumber products, but only use those that have been certified safe for residential plumbing systems.