In my XP3 the bottom is filled with 20ppm and 30ppm filter pads, middle tray is filled with 1500 grams of biomax, and the top tray has micro filter sponges.
Ok I have run into more proplems. My filter keeps putting out micro bubbles. Any idea on what causes this. When I cleaned the filter, I had to re prime it, but I did it the same way I did as when u first set it up. It didn't do it then.
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with XP's, the easiest way to prime (if you call plugging it in is priming) is to pre-fill the can with tank water in a sink or so before plugging in the top connector. no air, no shaking, no filling the top tube, etc. and it gives you another chance to exercise by carrying the full can.