Hello.. I set up my khd about a month ago with a brand new 2.1 doser... But pump 1 and pump 3 after 1 week at 2 tests per day.. Started squeeking.. Annoying noise from a super doser...i observed a dusty residue on the rolers of pump 1 and 3 and some wear in the blue cap.. I atribute that wear to the pump speed beeing at max.. Because pump 4 of the same doser works at speed zero dosing elements in more volume that pump1 and 3 per day and shows no wear at all... My question is.. Can i use speed 1 or 2 in the khd intake and outlet.. I dont care if it takes longer to test.. I only test twice a day...
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