I did the same thing; got a used p.m bullit 1 and have the same problem as you are having too wet foam that seems to be comming out like clear water in my overflow cup or it seems I get really dry skimmate but it won't travell up the neck of my skimmer... I don't have the instructions for the skimmer, but here is what I have found out.. Oh by the way I'm using a mag 7 for a pump... thats what the guy gave me with the set up he said it worked, my p.m looks older than the newer ones posted on the p.m. website, but same design... wondering if i mabe need a larger pump... mine is installed out of sump... step 1 open gate valve on drain fully open... assuming you have a gate valve. 2 turn off all air blue vale on injector. 3 ajust water level no more than 1" above black/grey box or just inside reaction chamber. 4 turn air on to the 5 or 11 oclock position, waterlevel should raise and then lower. 5 re-adjust gate valve so that water level is around the same spot 1" mark and let skimmm..... dont touch any thing. the p.m websight says this will work remember not to touch the water or adjust the valves it takes 24-48 hrs for this skimmer to break in and even feeding your fish will foul up your skimmate and make your skimmer run flat. though | really have no luck with mine.... yet mabe togeather we can figure this problem out. I don't think its my pump being underpowered but rather my bubbles being unstable. I have this skimmer running in my 75 gal bow frnt which i am cycling as we speak and it should be pulling crap out like crazy (tank looks really dirty) and has been cycling for about 4 weeks. my best advice is to go to there website check it out and see if yours works mabe ours both will magicaly start to work... i think I just have to leave mine alone for a couple days good luck let me know if you get fed up with yours and just get a different skimmer, i'm starting to think that way.....