I like to call this device the bull dick.
Parts needed: 1.---a PVC clean out fitting with its screw in end plug. 2.---a PVC coupling. 3.---a 12" piece of PVC pipe. 4.---a PVC cap. 5.---a tubeless tire valve stem. 5.---an electric drill with a bit. 6.--- a bicycle tire pump.
Sorry that I don't have any type of diagram but this is a pretty easy and cheap device to put together.All one needs to do is to drill a hole in the center of the screw in part of the clean out plug just big enough to pull the tire valve stem through, then screw it(end plug) back into its place.The end plug can then be lightly glued to the coupling, which in turn is lightly glued to the pipe.Now you have a 12" section of PVC pipe with a coupling,a clean out plug with a valve stem connected it. Now take the end cap and drill a few small holes in it and attach it tightly to the other end of the pipe do not glue this part as it is where the "cup" where filter paper will be placed into.
To filter something all one has to do is place a presoaked filter into the end cap "cup" and attach tightly to the pipe then unscrew the clean out plug, pour in what needs to be filtered, rescrew the plug and attach bicycle tire pump to the valve stem and hit the pump lightly 3 or 4 times-as much presure isn't needed.
This device can be scaled up or down to meet most of your ghetto filteration needs. SWIM prefers 4" diameter and uses several coffee filters at once. It's a lot better than the slow process of ghetto gravity filtering because the filters don't get clogged up as fast and the what's being filtered comes out a lot cleaner. There may be some conderation with certain solvents and the PVC glue but all the glue is on the top end of the device.