along the reservoir wall will scrub the liquid down toward the pick up location the geometry of the reservoir walls together with the wetting characteristics of the reservoir can also help to reduce the amount of residual unused medication internal angles or grooves that run in a direction down the side walls of the reservoir 7 can also be included the dimensions of the angles or grooves can be relatively small as compared with the dimensions of the reservoir 7 in which case the liquid will u201c wick u201d along the angles or grooves further the design can be made to cause the liquid to preferentially move in one direction along the length of these features by gradually changing the size or shape of the groove along its length for example if the internal angle of the groove becomes more acute the liquid will be preferentially pulled in that direction another technique for pulling the liquid toward the feed channel inlet 42 of the feed channel 6 is by make the gap between the bottom surface of the reservoir 7 and the feed channel inlet 42 sufficiently small to wick into this gap if the surfaces are wetting materials a further aid is to have the gap reduce in size taper or converge as the liquid moves in the flow wise direction towards the feed channel inlet 42 a gap that becomes smaller as it approaches the inlet to the feed channel 42 can encourage the liquid to flow in that direction turning next to fig2 an additional configuration of a nebulizer 300 in accordance with the present invention is illustrated in which the nebulizer is configured to reverse the flow of nebulized medication and then redirect the reversed flow towards.