I turned off the main shutoff to my house a couple days ago to put new valves on a faucet in a basement bath that I am remodelling. That went fine, but after turning the water back on I came to realize that my first floor shower no longer had any water pressure. The water was dribbling out of the tub spout, not even enough pressure to get the water out of the shower head. Now, the water pressure in the shower has never been good but now it is unusable.
So I took out the cartridges (its a two handle tub/shower faucet) and cleaned them, and tried turning the water back on with the cartridges out. The water shot out pretty forcefully, so I put the cartridges back in and still got just a trickle out the tub spout. So I conclude that the problem is in the shower control somewhere, and after trying to shove a snake into it along with various other tools to no avail, I cut the damn thing out so I could try and clean it out.
The bottom line is that I can't figure out where the blockage might be, and all I know is that is effects both the hot and cold equally. I soaked the thing in a solution of CLR last night but don't know if it did any good. Any suggestions would be appreciated, I would love to avoid going out and buying a new one. Here are some pictures of it: