Securing a Rio 600 Venturi pump

[magnosis]

I use a Rio 600 RVT pump to power my CO2 reactor, I like the pump for its low noise and venturi configuration, but what I hate about it is there is no protection from the impeller.  So far I've lost 3 fish because they managed to get too close and said pump turned into a meat grinder 

I've tried sticking a piece of foam in front of the intake but however coarse, it makes for a noticeable restriction on the pump's flow (unless I clean the foam on a regular basis, which is a pain because of where it's located in the tank - hard to reach spot, hidden behind plants and whatnot)

Does anyone use this pump, and found a good way to protect fish from the impeller ? 

[Brent Shaver]

I have never used the pump but one option would be to use the nylon screen around the propeller.  I have used this to keep my shrimp from becoming filter media.

[magnosis]

Fixed.  I bought little cartridges of carbon for 3.49$, emptied one, cut it in half and glued it over the pump intake.  It's like a little perforated plastic cover, works perfectly and easy to clean, too.