Water & Industry Hydrakos Water-Driven Dosing Pumps 2026
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Water & Industry Product Catalogue 2026
Hydrakos
Water-Driven Dosing Pumps
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Hydrakos Water-Driven Dosing Pumps
Product Overview
Performance
Injection Mode
D25RE020
D25RE050
D25RE100
10 - 2,500
10 – 2,500
10 – 2,000
Pressure [bar]
0.3 – 6
0.3 – 6
0.3 – 4
Injection dosage [%]
0.2 – 2
1–5
3 – 10
Concentrated additive injection rate [l/h]
0.02 – 50
0.1 – 125
0.3 – 200
Flow rate range [l/h]
Applications
Municipal Water Treatment
Fertigation
Livestock Farming
Food & Hygiene
Industrial Processes
Car Wash
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Water & Industry Product Catalogue 2026
Hydrakos Automatic chemical dosing systems Water-driven pump technology is based on a hydraulic motor pump activated only by pressure and water flow. Installed directly on the water supply line, the pump operates by using the water flow rate as a source of energy. The pressure and flow rate of the water actuate the motor piston which drives a second, product-dosing piston. The product is injected and mixed continuously with the water from the mains supply at the selected dosing rate percentage (rate of product/water incorporation). The dose of concentrated product is directly proportional to the volume of water passing through the pump, independent of variations in the flow rate and pressure of the mains water supply.
Hydraulic motor
Motor piston
The motor piston moves under water pressure, with a system of valves allowing the movement to be reversed. Each piston cycle corresponds to a predetermined volume of water which passes through the pump (motor volume). The speed of the motor varies proportionally with water flow.
Dosing piston
Clear water Solution water + % additive
Dosing assembly Courtesy of the dosing body’s adjustable capacity, the water-driven dosing piston continuously injects a fixed volume of product according to the volume of water passing through. Therefore, the operating principle ensures constant dosing independent of fluctuating flow rate and water pressure.
Dosing adjustment (%) Concentrated additive to be dosed
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Hydrakos Water-Driven Dosing Pumps
Features & benefits Low operating & maintenance costs Hydrakos’s robust components and intelligent design make the system inexpensive to both run and maintain
High-precision, repeatable dosing Operators can depend upon Hydrakos to dose a range of chemicals with superior accuracy every time
Non-electric The pump’s absence of electrical connection make it the perfect solution for operators seeking to achieve precise dosing even in remote locations
Reduced cleaning and servicing time The exceptional build quality of Hydrakos allows operators to spend minimal time servicing the system
Self-priming and efficient mixing Removing the need for manual priming, Hydrakos brings speed and efficiency to every dosing application
Easily regulated injection rate With an adjustable dosing percentage depending on the selected model, users enjoy ultra-tight control to prevent chemical wastage and associated costs
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Water & Industry Product Catalogue 2026
Hydrakos Automatic chemical dosing systems SEKO’s Hydrakos water-driven pumps are the latest addition to our world-leading range of chemical dosing systems, offering an alternative to automatic solenoid, peristaltic and motor-driven metering to serve a vast range of applications. Installed directly in the water supply line, the Hydrakos uses water pressure as its power source and automatically mixes concentrated chemical proportional to water volume regardless of variations in flow or pressure which may occur in the main line. This ultra-reliable dosing method means operators can rely on consistent performance in applications as varied as water treatment, automotive care and industrial processes.
Pump installation In order to optimise your installation and get the most out of your water-driven pump, we recommend the following guidelines are met: •
Refer to local water regulations
•
Install a filter upstream depending on water quality
•
Change dosing seals at least once a year
•
Rinse as often as possible with clean water
•
Turn off water supply and allow pressure to drop to zero before adjusting injection rate
•
Install necessary protections for excess flow, excess pressure and water hammer
Features •
Easily regulated injection rate
•
Simple dosage adjustment (in % increments)
•
Portability (emergency skids)
•
Self-priming and efficient mixing
•
Low operating and maintenance costs
•
Optimal water and polymer consumption
•
Dose any liquid or water-soluble product
•
Reduced cleaning and maintenance time
•
Precise, repeatable dosing
•
•
Non-electric (energy saving)
Automatic dosing stops in event of water flow ceasing
Specification Model
D25RE020
D25RE050
D25RE100
Injection Dosage
0.2 – 2%
1 – 5%
3 – 10%
Water Flow Rate*
10 - 2,500 l/h
10 – 2,500 l/h
10 – 2,000 l/h
Pressure
0.3 – 6 bar
0.3 – 6 bar
0.3 – 4 bar
Concentrated Additive Injection Rate
0.02 – 50 l/h
0.1 – 125 l/h
0.3 – 200 l/h
*For other fluids than water, please contact us
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Hydrakos Water-Driven Dosing Pumps
Hydrakos key code Model WDP
Water driven pump. Type
D25
Pressure
Flow rate
Ø Hydr Connections IN / EXT.
[bar]
[l/h]
[mm]
0.3 - 6
10 - 2,500
0.3 - 4
10 - 2,000
Concentrated product injection rate
¾” M BSP-NPT Ø 20 x 27mm
Adjustable dosage
[l/h]
[%]
[1:]
0.02 - 50
0.2 - 2
500 - 50
0.1 - 125
1-5
100 - 20
0.3 - 200
3 - 10
33 - 10
Injection dosage RE
External adjustable Dosage range
%
1:
020
2
50
050
5
20
100
10
10
Seals F
FPM
E
EPDM
A
AFLAS Body material P
PP
V
PVDF Mixing device 0
Internal Market 0
WDP
D25
RE
020
F
V
0
Western
0
Hydrakos with PP body •
The ideal general-purpose pump
•
Broad chemical compatibility
•
Suitable for fresh, salt and deionised water
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Commonly used for chemicals as varied as formaldehyde, potassium and sulfuric acid
Hydrakos with PVDF body •
Exceptional chemical compatibility
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Superior thermal stability and resistance to stress cracks
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High corrosion resistance
Globally Present, Locally Active
Twenty-three national SEKO companies across six continents means that, wherever you are, you enjoy the same exceptional level of service as every SEKO customer around the world. And an accredited partner distributor network allows us to provide local customer support in over 120 countries, so you benefit from region-specific knowledge and rapid delivery of goods as well as worldclass after-sales service and technical assistance.
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SEKO products are intended for professional use in industrial applications only and are not available for domestic or retail sale. SEKO reserves the right to amend and change specifications without prior notice. All pictures shown are for illustration purpose only. Actual product may vary due to product enhancement. Published data may be subject to change. © 2026 SEKO, Layout and origin: Eventus Labs, UK, 850003 WTCATA-HYD EN V04
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