Assertion: septic tank's content | /r/HasProperty | cleaned
Facets:
Source sentences:
text: The contents of the septic tank should be cleaned every two or three years or when the total depth of sludge and scum exceeds 1/3 of the liquid depth of tank.
text: The contents of the septic tank should be cleaned every two or three years or when the total depth of sludge and scum exceeds 1/3 of the liquid depth of tank.