Hi guys only just thought got 10 speed queen on the go looking really good,
But ive have not grown for 4 yrs my carbon filter was only used for 1 grow
4 yrs ago and its not been used since will it still be ok? or should i refill it? TIA

might of got damp or damaged ,not so sure bud, id get a new one just incase,

Buy one and keep the other as a spare. I have a crappy budget filter that has long since past its life expectancy but it is still fine in my drying space.

Thanks guys, piece of mind im getting 1, no point in getting busted for a few quid

yeah man i totaly agree just not worth taking the risk at all, possibly the most important bit of kit you need, god knows how people managed before these came along