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Originally Posted by Cathar
On the noise thing, one thing I've noticed with the impingement blocks and powerful pumps is that the blocks do develop a real "hissing" noise. With the "Storm" (which is also doing other things to stir the water up) and using really what are quite dramatically high pressure drops (11mH2O) the block is certainly about as noisy as a case-fan. Dropping back to a more realistic 3mH2O "high-end" level and the noise is audible with your ear near it, but not at any distance.
Perhaps something to consider in the quest for more pumping power.
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hmm - maybe you need to design in some acoustic damping
