For an activated Charcoal filter:
- How long do they typically last?
2 Is there a way to replace just the charcoal?
- For a 2’ X 4’ X 6’ shed, is a six inch filter OK for three to four plants?
- Because of high heat, is putting the filter on the floor a good option?
- Space is limited, is making my own flat filter to sit on top above the lights worth the cost and trouble?
Thanks in advance,