Only if you can plumb both/all exactly the same so one doesn't flow
sooner of better than the other. Not a good idea IMO.

It's also not a good idea to use carbon on water of unknown
microbiological content; IOWs, if you don't know for sure that there is
no type of bacteria in the water, not just say Coliform. Bacteria love
to live'nbreed in carbon, it provides them a lot of organics that they
thrive on.

Gary
Quality Water Associates