"An once of prevention is worth a pound of cure!"
See below for answers to your septic related questions.

What is a septic system? 
    A typical septic system has 4 main components-a pipe from the house, a septic tank, a drainfield and the soil. The septic tank is a buried watertight container. It holds the wastewater long enough to allow solids to settle out (form sludge) and oil and grease to float to the surface (as scum). It allows for partial decomposition of the solid materials. Compartments and a T-shaped outlet in the septic tank prevent the sludge from leaving the tank and traveling into the drainfiled area.  The wastewater exits the septic tank and is discharged into the drainfield for further treatment by the soil. Microorganisms in the soil provide final treatment by removing harmful bacteria, viruses, and nutrients before it eventually reaches groundwater.

Why should I maintain my septic tank?
    The number one reason to maintain your septic system is to save you MONEY. Failing septic systems are expensive to replace or repair and poor maintenance is often the culprit.
    Another good reason for maintaning your septic system is environmental protection. Safe treatment of sewage prevents the spread of infection and disease and protects water resources.

How do I maintain my septic system? 
    Pump frequently- You should have your septic system pumped (every 2-5 years depending upon your water usage and system design) and inspected at least every 3 years. 
    Use water efficiently- The more water a household conserved the less water enters your septic system.  Some ideas for water conservation- fill the bathtub with only as much water as you need, turn off faucets while shaving or brushing teeth, run dishwasher and washing machine only when full, replace old washing machines with high efficiency model, etc. Space out activities that dump alot of water into your system- Don't do all you laundry on one day, take a shower in the morning and run the dishwasher at night, etc. 
    Flush responsibly- Do not flush dental floss, feminine hygiene products, cat litter, paper towels, and other kitchen and bath products can clog and potentially damage septic system  components. Flushing houshold chemicals, gasoline, oil, and paint can stress or destroy the bioloical treatment taking place in the system or might contaminate surface waters and groundwaters. 
    Take care of your drainfield- Plant only grass over or near your septic system (roots from trees and shrubs can clog and damage the drainfield), Don't drive or park on any part of you septic system (compacting the soil in your drainfield can damage the pipes, tank or other components), keep roof drains, sump  pump drains and other surface water drainage away from the drainfield. Flooding the drainfield can slow down or stop treatment processes and can cause plumbing fixtures to back up.