HydroPower Ultra S
The HydroPower Ultra S is the most compact and affordable pure water filter in the Unger range. It has a single 6-litre resin bag, dimensions of 30 × 31 × 35 cm and a flow rate of 120 l/h, providing up to 6 hours and 600 m² of work per refill. No electricity required, with an integrated digital TDS meter. The ideal starting point for pure water window cleaning.
How long will the resin last with your water?
Enter your actual ppm or select your area to get an estimated guide to litres, working hours and surface area.
Calculator range: 1–2,000 ppm.
The area value is an approximate reference, not a measurement taken at your property.
At this ppm level, a HydroPower DI system may be uneconomical for regular use. We recommend considering a reverse osmosis system such as the Unger RO S.
Unger reference: incoming water TDS 275 ppm, output <10 ppm; laboratory values and approximate coverage. Values between reference points are calculator estimates, not an official Unger table.
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HydroPower Ultra S Unger — the most compact pure water filter in the range
The HydroPower Ultra S is the smallest and most affordable model in Unger’s HydroPower Ultra range. At just 35 cm high and with a single 6-litre resin bag, it is the most accessible DI resin system for starting out in pure water window cleaning, without compromising any of the key features of Ultra technology.
Its compact size makes it easy to transport and store, while its simple operation with the KeyLock function makes it the perfect option for anyone taking their first steps with pure water.
Performance per refill
With one resin charge and medium water hardness, the Ultra S produces up to 710 litres of pure water — enough for approximately 6 hours of work at full power with a performance of 100 m²/h. When the TDS meter exceeds 10 ppm, it is time to replace the exhausted resin bag.
Ultra S vs Ultra L — when to choose each one
| Ultra S | Ultra L | Ultra L | |
|---|---|---|---|
| Resin bags | 1 × 6 l | 3 × 6 l | 3 × 6 l |
| Coverage per refill | ~6 hours / ~600 m² | ~20 hours / ~2,000 m² | ~20 hours / ~2,000 m² |
| Height | 35 cm | 77 cm | 107 cm |
| Reference | DIUH1 | DIUH2 | DIUH3 |
The Ultra S is the right option for professionals starting out with pure water or with a moderate workload. If you work daily on intensive routes, the Ultra L or the Ultra LC offers greater autonomy between refills.
Key features
FloWater 2.0 technology — produces 30% more pure water per refill than standard DI systems, maximising the performance of each resin bag.
Integrated digital TDS meter — displays the hardness of the purified water in real time. Target value 0 ppm; change the resin when it exceeds 10 ppm.
KeyLock function — prevents incorrect operation. Changing the bag is quick and easy, even without previous experience.
Pre-installed dynamic flow regulator — guarantees optimum flow regardless of mains water pressure.
Shut-off tap — prevents spills during transport.
Metal hose connector — a robust, durable connection to the water-fed pole system.
No electricity — operates solely using mains water pressure.
Technical specifications
- Base: 30 × 31 cm
- Height: 35 cm
- Resin: 1 × 6-litre bag
- Flow rate: 120 l/h
- Coverage: ~6 hours / ~600 m² / ~710 litres per refill (medium water hardness)
- Reference: DIUH1
Resin consumable
The Ultra S uses Unger’s DIUBS resin pack, specifically for this model. Available in our shop in the HydroPower Accessories section.
As Unger Technical Service in Spain, we have all spare parts for the Ultra system available for immediate delivery. Call us on 627 588 844 if you have any questions about which model best suits your workload.
