Ontario Residential System Sizing Calculator

Installer sizing tool · Ontario residential

Ontario Residential System Sizing Calculator

Enter the project details to calculate design flow, preliminary Type A bed sizing, Waterloo Biofilter model options and Ontario precaster or Roth tank recommendations.

01 Project details

BedroomsTotal bedrooms in the dwelling

Finished floor areaSquare metres (m²)

Fixture unitsTotal fixture unit count

Native soil percolation time (T)Minutes per centimetre (min/cm)

Ontario precaster / Roth tankSelect an Ontario precaster or Roth Tank

Results appear below.

02 Sizing results

Total daily design sewage flowQ = A + greater of B, C or D

—L/day

Waterloo Biofilter

Recommended treatment configuration

—

Selected precaster

—

Option 1

Internal pump chamber

Anaerobic digester with internal pump chamber (ADIPC)

—

Option 2

External pump chamber

Separate anaerobic digester + pump tank

—

Biofilter tank

Tank for Basket System

—

Minimum required sizes

Final system / Type A sizing

Minimum required Anaerobic Digester size—1.89 × Q

Minimum required Pump Tank size—0.70 × Q

Type A Bed contact area—Formula used: —

Minimum Stone Area—Q/50 when Q > 3,000; otherwise Q/75

Preliminary residential sizing tool based on the supplied Ontario Building Code Part 8 criteria, Waterloo Biofilter model tables, Waterloo Biofilter CANBNQ Residential Precaster Tank Sizing 2026 v1.2 and supplied Roth Tables 7 & 8. Verify current OBC requirements, Waterloo Biofilter approvals, tank availability, site conditions and permit authority requirements before final design or ordering.