I just ordered 2 of the maxi-jets with the attachment needed for the bak pak filters.

http://amekaaquatics.com/Merchant2/m..._Code=MAXI1200

Maxi-Jet 1200 Powerhead -290 gph
Rio 600= 200 gph
Rio 800= 211 gph

According to the cpr manufacturer they claim the rio 600 and 800 pump the same amount of air regardless of the amount of flow so decrease efficiency on the 800 and recommend the maxi-jet 1200 (I am guessing more air is pumped as well as water with the 1200).

I take it though from the response that the filter I have is a good skimmer, am I correct?

I couldnt' find anything though on copper leaching out with the rios. As far as I know all of the powerheads have a sealed unit with the impeller ineracting with a magnectic field so unless you are talking about wearing away of the plastic between the impeller and the housing there should be no copper leaking.