Friday, 7 November 2025 Knowledge Articles
Maintenance, Troubleshooting & Handover | Using Rainwater at Home
Once a rainwater reuse system is installed, keeping it reliable comes down to regular inspection and following the Operation & Maintenance guidelines provided with the tank. Promax includes O&M guides with every tank, and they are also available for download from each product page.
For design references and system configuration tools, see:
Routine Maintenance
The Operation & Maintenance Guide outlines the key checks to ensure performance and longevity. Routine inspections help prevent minor issues from becoming major problems.
Recommended checks include:
- Tank stability — ensure the tank remains level and supported, with no erosion around the base.
- Lid security — confirm the lid remains properly fitted and weather-tight.
- Inlet and outlet fittings — inspect for leaks or movement.
- Pump inlet screen — clear any accumulated debris.
- Sediment buildup — if flow reduces, have sediment removed with a vacuum truck.
- After heavy rain — check inlet strainers, overflow, and pump housing.
Download an example O&M guide: Promax Slimline Tank O&M Guide (PDF)
Safety and Signage
Rainwater reuse systems supply non-potable water. This must be clearly indicated.
- Label all outlets “Non-Potable Water – Do Not Drink”.
- Use lilac-coloured pipework for all non-potable water lines.
- Switch off power before servicing the pump or changeover device.
- Do not enter the tank unless trained and properly equipped for confined-space entry.
Non-potable signage: Promax Non-Potable Water Sticker
Troubleshooting
Common system issues are usually straightforward to diagnose and resolve.
| Issue | Likely Cause | Solution |
|---|---|---|
| Pump not starting | No power supply, float switch issue, or thermal trip | Check power, reset pump, verify adequate water level |
| Pump runs but no flow | Blocked inlet or empty tank | Clear debris or wait for rainfall to restore tank water |
| Frequent cycling (pump turns on and off repeatedly) | Minor leak, pressure loss, or debris inside controller | Inspect connections, repair leaks, clean filters and valves |
| No water during a power outage | Powered changeover device requires electricity | Use a passive (pressure-based) changeover device if outage resilience is required |
| Low pressure at outlets | Restricted filter or undersized pipework | Clean filters, check changeover device, confirm pipe sizing |
Installer & Owner Handover
A proper handover ensures the homeowner knows how their system works and how to look after it.
- Provide the Operation & Maintenance Guide
- Include the system plumbing schematic used during installation
- Record maintenance schedule and warranty documentation
- Confirm the system includes a dual-check valve for backflow compliance
- Demonstrate the automatic changeover process and how to recognise pump restarts
Long-Term Care
Following routine inspection and maintenance supports a long service life for the tank and pump. Homeowners should maintain a simple log of cleaning and checks, especially following extended dry or wet periods.
For support or system advice, use the live assistance tool: