Inputs
Getting started
New to this tool? Turn on Worked example beside the page title. It loads a fully populated surface-water supply so every tab is filled in. Turn it off and your own entries come back.
This tool screens drinking-water treatment process trains from source-water quality and supply inputs, for concept selection. It gives guidance only. Work through the five steps in order: Inputs, Output (the selected train), then Options, Logic and Report & Save (Premium).
On this tab, describe your source water and supply. The model uses these to select a treatment train.
- Source: water type, protozoa risk class and supply size (which sets the DWQAR rules that apply).
- Water quality: enter min / average / max and the number of samples for each determinand. More samples raise the confidence of the selection. For the organics group (UVA / colour / DOC) at least one parameter needs a complete min, average and max.
- Flags: high-organics and silica/iron-sand flags, and whether the source has weather-driven quality events (all three drive process selection).
- Resilience: seismic importance level, continuous-treatment need and redundancy standard (drives the minimum number of parallel process streams).
- Preferences: where you have a preferred chemical or process, set it here; otherwise leave "No Preference" and the model applies the NZ defaults shown under each control.
Amber and red flags are prompts to look, not instructions to act.
Output
Guide: using this tab
The treatment train selected for your inputs, shown as a process flow diagram and a list of selected processes.
- Protozoa log credits: the required credit (from the source class) against the credit provided by the selected barriers.
- Disinfection barriers: a count of the independent disinfection barriers in the train.
- Resilience: the minimum parallel streams per main process unit for your redundancy standard.
- Advisories: engineering points worth a second look; they never block the selection.
Amber and red flags are prompts to look, not instructions to act.
Options
Guide: using this tab
The viable treatment architectures for this source water, side by side.
- Each option forces a different filtration route (conventional RGF, MF/UF membrane, cartridge, or reverse osmosis) and runs the full selection engine.
- Options are compared on protozoa log credit, disinfection barriers and process count, with feasibility judged against your source water.
- Trade-offs summarise the engineering considerations for each route.
- View full flowsheet sets that route and opens the Output tab so you can drill in.
An option marked "Not applicable" means the source water falls outside that route's envelope (for example, too turbid for a bare membrane).
Amber and red flags are prompts to look, not instructions to act.
Logic
Guide: using this tab
The full decision logic for all processes, showing exactly why each one was or was not selected.
Each process lists its criteria: include triggers (any one selects the role), exclusion criteria (any one blocks it), preference gates and applicability gates (all must hold). This is the transparent audit trail behind the selection. Click a process to open its criteria.
Amber and red flags are prompts to look, not instructions to act.
Report & Save
Guide: using this tab
Export your assessment or save your work.
- PDF report: a formatted report of the tabs you select.
- CSV: the inputs and selected processes as a spreadsheet.
- Save / load: a JSON file of all settings and results that you can keep and load again later.