| 摘要 |
<p>Heating systems and methods of preventing freeze-ups of underground tank systems. In septic underground tank systems, bacteria activity is enhanced by raising the temperature within the bacteria's environment. The preferred heater system includes a thermostatic control unit with a temperature sensor which may be selectively located to sense the temperature within a portion of the underground tank system. The heating systems and methods are particularly useful in mound or drainfield septic systems as well as underground water tanks.</p> |
