The present invention is to a filter plate and a collection system having
an upper filter plate and a lower collection plate. Each has two or more
wells in register with each other. The filter plate has an underdrain
containing a spout. The spout is offcenter of the centerpoint of the
wells between which it resides. The spout is close to at least one wall
of the well of the collection device but set off from that wall by a
distance sufficient to ensure easy assembly and disassembly of the
devices without contact or damage of the spout with the well of the
collection device. In this manner, any drop that begins to form contacts
the adjacent well wall and travels down it into the collection device.