Septic Pump / Dose Tank Volume

Net dose per cycle, pumped volume per cycle and per day, and the dose-to-void ratio for a timed-dose pressure-distribution field. Per the USEPA Onsite Wastewater Treatment Systems Manual; the dose count and float settings on the permit drawing govern.

Net dose = daily flow / doses per day; pumped per cycle = net dose + drainback; pumped per day = pumped per cycle x doses; dose-to-void ratio = net dose / drainback (target >= 5).

USEPA Onsite Wastewater Treatment Systems Manual (EPA/625/R-00/008); university onsite-wastewater extension low-pressure-pipe design guidance, by name.

Free at epa.gov/septic. Extension LPP design guidance free on land-grant university extension sites.

Estimate. AHJ and licensed plumber / gas fitter govern. Verify against the IPC / IFGC edition adopted in your jurisdiction.

Field names used by the API: daily_flow_gpd, doses_per_day, drainback_gal, net_dose_gal, pumped_per_dose, pumped_per_day, void_ratio

• Default doses per day 4 (editable; more, smaller doses rest the soil better)extension LPP design guidance
• Dose-to-void target net dose >= 5x the drainback volume so the field pressurizes before the dose is spentextension LPP design guidance
• Drainback handling drainback returns to the tank and is re-pumped (pumping energy, not lost flow); the dose count, dose volume, and float settings on the permit drawing governEPA/625/R-00/008