The Ontario Building Code | Class 4 Sewage Systems
8.9.3.4. Class 4 Sewage Systems
(1) Septic tanks and other treatment units shall be cleaned whenever sludge and scum occupy one-third of the working capacity of the tank.
8.9.3.4. Class 4 Sewage Systems
(1) Septic tanks and other treatment units shall be cleaned whenever sludge and scum occupy one-third of the working capacity of the tank.
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