for example photosensitive material exposure and development processes can be used to fabricate the inlet side passageways and outlet side passageways in a separate layer which is then bonded to a lower substrate and the filter pores can be reactive ion etched into an upper substrate one limitation of the internal filter with interleaved comb fluid pathways connected by multiple sets of filter pores shown in fig1 is that there is only one inlet side passageway 110 and only one outlet side passageway 120 this limits the types of fluids the device may handle simultaneously to one there are many applications such as color printing where the internal filter needs to handle multiple sources or multiple fluid processing sites independently fig2 shows an eighth exemplary embodiment of an internal filter with interleaved comb fluid pathways connected by multiple sets of filter pores according to this invention as shown in fig2 in this eighth exemplary embodiment the multiple sets of filter pores are configured in alternate positions to support multiple independent fluid sources and or multiple independent fluid sinks as shown in fig2 the inlet side passageway 610 and the outlet side passageway 620 are used for one type of fluid for example a yellow colored ink the other inlet side passages 630 650 and 670 and the other.