09-28-2009, 10:49 PM
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The answer is sales and profit. These units have a use in certain applications, such as very large fish load marine predator systems, or freshwater setups.
Fortunately, most manufacturers have changed their sump designs to include a protein skimmer and refugium, rather than bioballs, because the public has become much more knowledgeable. Unfortunately, a certain percentage of people do not take the time to research for themselves.
It will take the LFS owner refusing to carry product which is not beneficial for their livestock for these units to no longer be offered. Unfortunately information travels VERY slow in this hobby. Berlin style systems utilizing a protein skimmer, live rock, and live sand have been uses successfully since the mid 1990's. Here we are, some 15 years later, and people still are setting up marine systems without the use of a protein skimmer, which is akin to driving a car in the dark and sticking a flashlight out the window.