Tunze didn't fair to well and is redoin their housing because of this. And hydor even being newer to propeller pumps is bout spot on with theirs. They all are good pumps I own each and don't use the Tunze at all just to much direct flow for size of tank. Love the Mp20 we have n will upgrade kit to newer Mp40 some day. I look at this study and see Tunze comin out stronger in the end as a product. They have thanked them for the study n will use it to make us a even better product just my 2 cents
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