The system the construction pages above describe:

• produces treated wastewater suitable for surface irrigation. This is a high level of treatment and achievable only with primary + secondary treatment.

• operates off-grid and utilises solar panels and batteries to operate the pumps required for surface irrigation of treated wastewater to feed plants.

If you just want a simple system with subsurface soakage, then build the primary treatment vermidigester and your own soakage trenches.