does anyone out there have a berlin triple pass skimmer? i have had it hooked up for about a month now and it seems like it isn't putting anything in the cup. it's foaming but nothing is coming over into the cup. i have tried little air, alot of air, cleaned the cup, and tore the skimmer back apart. during the first week i had it running, i filled up a 20 oz bottle of skimmate, now nothing.