could be used if a check valve not shown were to be placed between the pump 56 and the stinger 51 as shown in the fig1 8 in one application of the invention a 250 scfm blower constituting the vacuum source 15 was fit to a 200 liter open top drum 18 a lid clamp secured the lid 10 to the drum 18 the lid 10 was approximately 22 u2033 in diameter a 3 u2033 pipe inlet port 12 is coupled to a disengagement chamber 12 b which measures about 3 u00bd u2033 by 8 u2033 wide by about 2 u2033 high above the lid 10 the direction plate 22 extends downwardly from the lid 10 about 2 u2033 with a 8 u2033 width to redirect influent away from the outlet port 14 a baffle 24 is positioned substantially centered below the inlet port 12 the baffle plate 24 is supported by the direction plate 22 and extends laterally towards the periphery of the lid 10 and thus towards the drum wall the baffle 24 is smaller than the chamber opening and measures approximately 3 u00bd u2033 laterally or radially and about 4 u2033 in width or 4 u2033 shorter than the chamber width and providing about.