Septic System and Tank

Some of you may be familiar with a septic tank; some of you may not be.  I will give you a short explanation of what our particular type of septic system does.  Our septic tank is a 3 chamber tank and the system is referred to as a sand filter septic.

Here is (to the best of my knowledge) how the system works:
1.  Flush the toilet or drain the sink
2.  The waste water flows down through the plumbing and out of the house down the hill to the septic tank.
3.  The waste water enters the first chamber of the septic tank.  Any heavy materials sink to the bottom and the liquid does not.
4.  Once the liquid has reached the top of the first chamber, it is filtered as it falls into the second chamber.
5.  Same process as with the first chamber (although the heavy materials are much less) and onto the third chamber.
6.  Instead of merely spilling into the septic field.....the water leaving the last chamber is shot (yes as in the implication of great force!) down into the sand filter.
7.  The filter is made up of sand and giant tubes of packing peanuts.  The water filters down through these layers.
8.  The water from the filter runs down a tube and into the pond.
9.  The "guarantee" on this system:  The water coming out of the sand filter...is drinkable.  (I am not going to try it).

Disclaimer:  If there is anything that needs changing (meaning Ryan says I didn't explain it well enough), it will be in the comments below.