<BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote
Inexpensive is part of it I'm sure.. but in talking to several skimmer manufacturers and complaining about rio reliability, pretty much all of them say they would switch to a maxijet if the maxijet came with a real venturi.. the venturi kit they sell is completely inefficient and doesn't make nearly the air the rio reverse venturi makes. Some companies screwed around with the otto pump as a rio replacement as it also comes with a similar venturi, but in the otto there is another issue.. the venturi hole is TINY and it clogs up really fast, which hurts performance.
As for CPR, yeah.. they aren't particularly honest about the pump issue.. even if you stick with rios, the performance of a rio 800 is a thousand times better than the 600, but they'll tell you flat out that the 800 is too powerful, and that's why they don't use it. What a joke.