My house is on a well and we have a very old 1/2 H.P. F & W shallow well jet pump (I think). I can't find any info online about the pump to be sure of that, but that's a question for another day. There is what appears to be some kind of filter connected to the pump discharge line about a foot above the pump. The valve before the inlet of the "filter" has been off since I have owned the property, so not sure when it was last used. The only place for water to exit the "filter" is what looks like (2) 1/4" openings, one at the top of the "filter" and one at the bottom. The opening at the top has a tube that is connected to the suction pipe near the inlet of the pump, and the opening at the bottom has a tube that is not connected to anything, but I assume it was connected to something at some point. I can't find anything online that resembles this set up. The pump and everything is operating as it should, just curious what this is as I don't know much about filters/strainers or other pump accessories.