1. Septic systems

2. Septic systems process sewage by:
Sedimentation, which is the separation of the solids from the
Liquids which occurs in the tank itself.
Decomposition which is the liquefaction of the sewage it requires
It requires the aid of bacteria and takes place in two processes.
Aerobic requires oxygen
Anaerobic which does not require oxygen
Purification:
This takes place in the absorption field.

3. Parts of a septic system:
House sewer:
4-6 inch line with a slope of 2 feet, 1 foot minimum, per 100
Feet of run
Below frost line of soil
Septic tank:
Can be made out of metal, concrete, plastic, or fiberglass.
Should be big enough to hold sewage for 70 hours before releasing.
750 gallon minimum and you should add 150 gallons for every
Bedroom in the dwelling.
At least 30 feet downhill from the house, in a straight line with the
House.
Sewage entering the tank should be directed down into the tank, and
Liquid leaving the tank should have no solids in it.

5. Sewer outlet should be 4 to 6 inch pipe that are water tight connected to
The drain field.
Absorption field:
Must be located 200 feet away from water sources.
Located away from wet areas.
Located where there is NO flooding possible.
Drain lines are usually parallel 10 feet away from each other.
Lengths of fields depends upon the absorption rate of the soil.

6. Care and maintaince:
Do NOT use excessive chemicals in drain water as it may kill the
Bacteria in the tank.
Do NOT use too much soap when washing as it may cause excessive
Foaming in the tank. Not separating solid and liquid.
Do not allow excessive grease to flow down the drain as it may cause
The tank to fill up quickly
Do NOT forget where the tank is located, or plant trees near the tank
Or absorption field.
Do install a grease trap
Do pump the tank when the sludge reaches about a foot deep in the
Tank.
Have it inspected occasionally(more than once every thirty years)