Filters mains or suitably pre-treated tank water, and can provide pre-filtration for RO. Uses existing water pressure; no electricity needed.
Includes: Three-filter unit with cartridges configured for your water source.
StageTwo provides flexible cartridge filtration for mains water, suitably pre-treated tank water or pre-filtration before an RO unit. It uses your existing water pressure and needs no electricity. Install it where it suits your plumbing, with access for filter changes.
Cooking water needs drinking-water treatment too. Boiling kills germs but does not remove heavy metals or nitrates. For canal, river and collected rainwater setups, use FinalStage RO after suitable pre-filtration for drinking and cooking.
Pump pressure: conventional cartridges may reduce flow; we recommend at least 35psi (2.4 bar). The high-flow Argonide NanoCeram® Filter Cartridge removes this restriction and the 35psi recommendation does not apply.
Warranty: 2 years. If something breaks, let us know. We’ll send a replacement part where needed and get it resolved as quickly as possible.
StageTwo combines ultrafiltration or ceramic options with carbon filtration to remove remaining contaminants or microorganisms. Water softening can also be added to help protect appliances from limescale and improve your shower experience.
Use StageTwo on a mains supply, after StageOne or similar source-water treatment, or before an RO unit. On a tank-fed system, install it after the onboard pump or accumulator. The cartridge combination should suit the water source and purpose.
Please note that StageTwo can reduce standard water flow because conventional cartridges create resistance. A 25psi pump may not be enough; we recommend at least 35psi (approximately 2.4 bar). If you use the high-flow Argonide NanoCeram® Filter Cartridge, this flow-restriction issue is eliminated and the 35psi recommendation does not apply.
| Source water purified | Water purified by StageOne or similar / stagnant tank water or mains |
|---|---|
| Power use | 0 watts |
| Dimensions | W35cm x D15 x H35 |
| Weight | 4kg (dry) / 7kg (wet) |
| Weatherproofing | Indoor or outdoor use |
| Max pressure | 60psi |
| Filters | 3 x 10" x 2.5" standard filters (type varies depending on use) |
| Warranty | 2 Years |
| Filter change frequency | 4-8 months |
|---|---|
| Running costs | £30-40 per year |
Warranty: 2 years.
If something breaks, let us know. We'll help identify the issue, send you a replacement part where needed and get it resolved as quickly as possible.
At Offgrid Water, we want every customer to have a working system. Happy customers are the best recommendation we can hope for.
Inside the system
Hover over a numbered point or select a feature. On a phone, tap to explore.
Hover, tap or use the feature buttons. Where labelled, concealed components are marked on their casing; they are not exposed in this view.
Supply
Mains, tank or pre-RO filtration
Use with mains water or suitably pre-treated tank water, or to provide pre-filtration before RO. Choose cartridges to suit your water source.
StageTwo uses your existing pump or water pressure. It is not a source-water pumping unit.
Cartridges
3 × 10-inch cartridges
The cartridge combination is configured for the source, using carbon and ultrafiltration or ceramic options.
For full drinking-water capability, pair with FinalStage RO.
Pressure
Check the existing supply
Conventional cartridges can reduce flow. The listing recommends at least 35psi for that configuration.
The high-flow Argonide NanoCeram option changes this requirement; confirm your chosen configuration.
Fit
35 × 15 × 35cm
Under a bed, beneath steps, in a cupboard or mounted on a wall. It can sit after your onboard pump or accumulator; it does not have to be under the sink. No electrical supply is needed.
Maximum listed pressure is 60psi.
Maintenance
Typically every 4–8 months
Leave space below the housings for cartridge changes and keep a record of the installation date.
Intervals depend on use, source water and the exact cartridges.
