I am going back to a septic system at the farm when I build there. I am not looking forward to it, again. My old system, actually two systems modeled after the Army way. I had a kitchen / washing machine tank and line that was a straight trap, no septic action at all. Then I had a septic tank and field line system hooked up to the bathrooms. My problems were always sand related.... sand has no nutrients and septic flow is full, so everything growing in sand wants into the field line. 
Oh by the way if you plant grass over a septic tank, do not plant Bahia, its roots grow up to 17 ft deep and is why it is planted on road sides.
Ed
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The three Rs: Respect for self; Respect for others; and responsibility for all your actions.
"Is life so dear, or peace so sweet, as to be purchased at the price of chains and slavery? Forbid it, almighty God! I know not what course others may take, but as for me, give me liberty, or give me death!"
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