Quote:
Originally posted by Cossey3
any details of the other testbed because the one mentioned above is hopelessly under pumped (the flow rate will be far too low to show the cascade at anywhere near its best) maybe this will cause the difference as the murk3 m,aybe tuned for a much lower flowrate which wouldnt work for a cascade
a barb is the bit the the hoses connect to.
eg 
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Oh sorry I thought barbs are springs
my english is really bad!
It could be possible that the flow rate is too low for the cascade. I thought it was a Hydor 20 - but im not sure!