A downhole mixing tool and method for removing sand and other debris from a wellbore which combines the sand with a treatment fluid so that the sand is lifted to the surface of the well for removal. The storage tray consists of a number of compartments or recesses usually in a layout of two or three rows by five columns. In some embodiments, the second metal contact also has a filament placement structure thereon extending into the ion conductor material toward the first filament placement structure. Each incubation site is adapted to hold an aliquot of liquid and is sized and shaped, and formed of a suitable material, to hold the aliquot within the well by surface tension. The collector electrodes of the other two transistors similarly are connected together and to the other output terminal. This packet processing time includes a time between the receiving of the request packet and the transmitting of the reply packet.