Its a little tricky. The filter is in the fluid, at the bottom of the Canister/reservoir. the filter is a ring, about 30 mm tall, with a sheetmetal disc sitting on top of it. All this is under the fluid. There are a couple of 7 or 8 mm holes in the disc. You that the spring off the screw shaft and used a magnet or a Phillips screw driver in a hole to get the disc out, the reach in and grab the filter. It takes a lot to plug that filter.
Don't know why u are getting the squirts, though.