Filtering Paint

I have been using a metal mesh faucet strainer.  It's available at any hardware store, plumbing section.  These faucet inserts are very, very inexpensive and come in a pack of 3 or 4.  I look for the smallest (finest mesh) pattern they have.  This strains my enamels and acrylics very well.  After straining, I rince them with the appropriate paint thinner and reuse them for future paint sessions.