I agree. spending a little more on a pump can get you better performance with the right kind of design. People are already willing to throw away $60 on pumps, what's another $40?
I just put in another one of my prototype blocks. It has many restrictive passageways but I am still able to get high water velocities in the block because I have a pump that will handle the pressure. One of them puny pumps with the impellar free floating by a magnet will just rotate less under back pressure, thus you will not get the benefit of higher water velocity when it is forced through a restrictive opening in the block design.
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