Rational iCombi Pro Original Installation Instructions page 68

8 | Water connection
Set a weakly acidic decarbonization via a hydrogen ion exchanger (H
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Sodium ion exchangers (salt water) (as are common in dishwashers) are
not recommended.
Phosphate dosing is not recommended because of its negative effect on
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the water system.
Notes on connecting the water filter
The diameter of the water hose must be at least 1/2 inch ID, to the water filter
at least 3/4 inch ID.
When using a combination of water filters, observe the order of the filters in
the flow direction:
(A)-(B)-(C)
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Or
(A)-(B)-(D)
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+
).