Quote Originally Posted by Rockafeller85
how do you know when to change the filter?
is there a formula or general rule?
Most of them, will say 6-12 months... I know they can last longer or less. Depends how often its on and how much activated carbon comes accross smells that require (are automatically) caught by the filter!!

But my general rule is, if it smells dank, swap your coal tank..

:thumbsup:

checkout my grow log too, just installed my own cooltube..

Peace,
Denial
denialisback Reviewed by denialisback on . Cool Tube? i have a question about cool tubes. well i few questions. When using one do you lose any lumens? and if so is it werth it to have one? i'm not to the point yet where im ready to use hps but it wont be long befor i am. Is this fan 6 inch In-Line Fan 268 CFM EliteHydro.com larg enough for a 250 or 400 watt hps wit cool tube? Slowly but sure i'm figuring everything out. thnx for all the help Rating: 5