Help with booster fan pls!!!

Okay so at the time i bought my 4" carbon filter it was perfect for the 1 400w cooltube i had but now im adding a s3cond 1 and have to run more hose and Ill need more then 200cfm. I checked out the 20$ inline booster fans 100cfm but it says i cant use with carbon. Do i have to buy abother inline like the one that came with my setup?

yep, inline booster fans do nothing, get you a bigger like 750 cfm with a fan speed controller and you can cut it down to what you need