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I was thinking the same thing when I saw it. It was a hardened piece seated in the nozzle. The piece was in fact larger than the filter screen. The only theory I could come up with is that possibly small fragments over time made it through the filter, bonded togther and eventually filling up the nozzle closing it. I have not checked the nozzle since it was first installed approximately 6 months ago. I had a problem with the unit and was replaced with another brand unit. The carbon was larger than the nozzle diameter (M5) and could not push it through the hole, had to dig it out.
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