Well, I don't know what type of material the insert is made of, but the idea seems valid.
I wonder if it will vibrate due to the water pressure, and make some noise associated with it.
Still, the workmanship is very good.
This manufacturer also produces the 1A-HV2 and 1A-HV3 blocks, which have good performances, seeing that both are micro-channels, and use a Eheim 1046 as a starting point.
As everyone seems keen on low flow blocks, it'a another idea to join the club.
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