Septic systems rely on a delicate balance to function properly. A clog, loss of bacteria or a fast buildup of solid waste in the tank could all lead to a system breakdown that could be inconvenient as well as costly to repair. As a homeowner, one of the best ways that you can care for your septic tank is to avoid flushing problematic items down into your septic system. Knowing which items not to flush and why they shouldn't be flushed can help you care for your tank.