[exim] Two transport filters

Hello!
I need to pass messages through two transport filters. If I write:
transport_filter= /path/to/filter1 params | /path/to/filter2 params
then messages are passed through only filter1 but not through filter2. Why it
does not work? I made shell script where I put the command above but this
worked not reliable. May be there are other ways to solve my problem. Can
exim deliver message from one transport ot another? shadow_transport does not
match because it does not work in remote smpt transports.