Looking for Seahunter or Fishnut
I run 1-2 cups of hot (almost boiling) RO water through the venturi every 2 weeks - this dissolves any calcium/crud deposits, and keeps it open and functioning well. Before I adopted this routine, I was taking it apart and cleaning it often. I have not noticed any sucking noise, but it may be drowned out by the sound of the pumps and the overflow.
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