I had time to un-box and inspect the Vertex media reactors.

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My initial reaction is that of disappointment.

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Both units were received from BRS having been opened with the seals broken

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The top O-ring on one unit is damaged, the O-ring on the other unit was badly twisted.

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Although difficult to see in the photo, the section where the downtube and O-ring mates with the top-lid is badly scarred which, if left unpolished, I imaging would quickly destroy the O-ring.

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One unit was supplied with a spare main O-ring (seen in the bottom of the right unit) whereas the other contained no spare.

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My greatest disappointment is the overall design of the unit. I was willing to pay a premium for these as I had hoped they would provide the simplest/fastest cleaning and media replacement. The downtube O-ring has to be engaged 4 times for each cleaning and media replacement as both the top lid and top diffuser plate must be removed over the very tight-fitting O-ring on the downtube. It's very tedious to do. Based on the fact one O-ring was received damaged and the other twisted - Even with proper lubrication, it will seemingly result in a very short life and far too-frequent O-ring replacement.

I'll reach out to BRS and see how they and Vertex will handle the issues before determining if I keep these, or return them and choose alternate reactors.