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Descaling with submersible pump Alkabest (ECAIA) water ionizer
The Alkabest (formerly Sanuslife) water ionizer, made by the manufacturer Biontech in Korea, is a special case because it is not as easy to descale as other water ionizers.
Normally, water ionizers are descaled directly via the wastewater hose or the outlet hose. However, this is different with the Biontech water ionizers (including ECAIA / Alkabest). Here you have to remove the second filter and introduce the citric acid with an extra thick rubber hose and close the circuit via the outlet.
The most sensible thing to do is to simply follow the video on how to descale the ECAIA / Alkabest water ionizer.
Link to the post