I downloaded the files posted in description of this video: http://www.youtube.com/watch?v=uXobd5aNC88
(Two files: particle_manifest.txt and combine_fx.pcf)
And then put them into: \half-life 2 episode two\hl2\materials\particle
Then it says:
Attempting to create unknown particle system ‘water_faucet’
I don’t know how to fix it, maybe there’s some basic water drop particle effect that VALVe put into Orange Box that I may use?