carbon filter expensive to use or what????

As the title says arre carbon filters expensive to use I.e. the inline fan. I'm in the UK. by the way in arented house but electrics ont meter 1st time I've had to grow like this and its cost a bomb but worth pay out int end.

I'd like to answer your question, but you seem to have forgotten what it was. Take more than 30 seconds to formulate your next post please.

Take more time posting. But no they dont cost hardly anything to run. Just whatever it costs to buy.