[awesterink]

After digging through tons of threads about backpressure and flow speed, I learned that if the channel in a WB is narrower than the rest of the loop, the flow speed in the block increases, but the backpressure also increases (which I believe reduces flow rate).

I currently use Innovatek blocks, which have fairly narrow 1/4" ID fittings for its crappy 3/8" OD tubing. My Eheim 1048 seems to be fighting backpressure, as it is quite noisy.

I plan to go to 1/2" ID Tygon tubing all the way, using the 1048 and a BIX rad. I can put 1/2" fittings on the blocks (1/4"NPT threads), but the internals will probably still be quite narrow.

So the question is...should I stick with the Innovatek blocks and choose for good WB flow speed with crappy backpressure, or would I be better off with e.g. the DD MAZE3 and DD GF4 blocks?