In addition to tap water and electricity, our electrolysers require ion exchange resin.

Ion exchange resin

The PEM stacks used in our electrolysers require fully desalinated ultrapure water in accordance with DIN ISO 3696 type 1 with a conductivity of less than 0.1 µS/cm. Since the tap water supplied usually has a conductivity of 300 to 800 µS/cm [1], it must be desalinated before being fed into the stack.

As a first step, the water passes through the pre-desalination cartridge (“VE cartridge”). In this cartridge, the conductivity is reduced to approx. 1.5 µS/cm. The VE cartridge extends the service life of the ion exchange resin in the ultrapure water tank.

From the VE cartridge, the water enters an area in the ultrapure water tank filled with ion exchange resin. Here, complete desalination takes place.

Purolite MB400 is used as the ion exchange resin.

[1]: www.welltec-wasser.de [Online] [Zitat vom 10.11.2021]
https://www.welltec-wasser.de/de/ratgeber/lesen/leitfaehigkeit-des-wassers.html