Here are some other sites which seem to have specific information about the repair / maintenance of onsite wastewater disposal systems.
Septic Tank Info dot com Lots of good information.
Texas
On-Site Wastewater Treatment Resources Council
Texas Water
Resources Institute
Remediating
Failed Septic Tanks Near Lake Livingston Texas
Remediating
Failed Septic Systems with Microbubble Aeration Units
National Onsite Wastewater
Recycling Association, tel. 1-800-966-2942.
Return to
Septic Tank Page, which has lots more information.
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