A conversion unit needs a complete-system proposal
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“Conversion” does not answer whether the complete system works
Products may add treatment equipment to an existing tank or follow it with another stage. The proposal still needs to address the old vessel's condition, hydraulic arrangement, discharge route, performance evidence, power, access, maintenance and the rules for the site.
Establish the existing installation first
Ask a competent person to identify the tank type, compartments, structure, inlet and outlet levels, capacity, ventilation, access and downstream route. A conversion fitted to a leaking, damaged or wrongly connected tank is not a complete remedy.
Questions for a written proposal
- What exact product and configuration is proposed?
- What evidence covers this product with this existing tank arrangement?
- What influent load and population were used?
- What outlet quality and operating conditions are claimed?
- Where will treated effluent go, and which rule or permission supports it?
- Which electrical, alarm and ventilation work is included?
- What commissioning demonstrates correct installation?
- What servicing, desludging and replacement parts are required?
- Who carries responsibility for the combined system and warranty?
Ask whether the completed arrangement meets the relevant standard cited by the regulator; do not assume a component certificate covers the entire site installation.
Compare with other remedies
Put conversion beside sewer connection, a correctly designed drainage field and full treatment-plant replacement where they are genuinely viable. Compare completed cost, disruption, design life assumptions, power, service obligations and how each option resolves the diagnosed problem.