Tanks range from 500-10,000 L, made of CSA-approved polyethylene or precast concrete, with watertight seals and access risers for OBC-compliant inspections.35 They feature inlet/outlet baffles, effluent filters, and optional pump chambers for pressurized systems, designed for freeze resistance in Ontario winters (buried below frost line, ~1.2 m). Canadian Shield Consultants tailors sizes to daily flow rates (e.g., 1,100 L/day for a 3-bedroom home).