Here is a way to make carbon filters for less than $3 each,they take about 30 minutes to make & all components & materials can be bought at any meijers store.

Materials needed.

1 4 pack Scotch Brite cloth towels from Meijers............$2

1 Bottle Activated Carbon from Meijers or fish store......$6

1 sewing needle & thread from Meijers........................$2

Total cost for 4 carbon filters...................................$10.

First you start out with the Scotch Brite cloth,its very thin & extremely strong,i find it much stronger than aluminum window screen material,its next to mpossible to tear yet the weave of the material is such that it will not restrict air flow.

Take the Scotch Brite & fold it in half or to a smaller size to fit your needs,like this.



Then take & sew 3 & 1/2 sides of the Scotch Brite closed making a pillow case looking thing,make sure to leave a few inches open to fill the "pillow case",then pour in the Activated Carbod to a little less than half way full & sew up the spot that was left open to pour the carbon in.

Here is the carbon.



Here are 2 finished Carbon Filters.



As for attaching them to what you need to there are several options,there is always duct tape in a pinch but i connect mine using hose clamps from the hardware store,the hose clamps make it easy to take the filter off if needed & is more secure that tape.

These work every bit as good as a $80 carbon filter i bought off of ebay & cost less than $3 each & about 2 hours time to make 4 of them,its not getting any cheaper than that.

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My 4 day $40 bud dryer,http://www.rollitup.org/grow-room-de...ml#post2087235My DIY $3 Carbon filter,http://www.rollitup.org/grow-room-de...on-filter.html

Wow that's awesome! I was thinking about making carbon filters, but I got a question, what do ya do with em now Forgive the newbie question, but the carbon has to be wet to be activated right? Err so how do you use them, put them behind a fan or something? Or keep them wet???

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How big are they??? It's hard to tell without something in the pic for scale...Great Idea!!

you think I could find that shit in Walmart

I find that so far my home made carbon filters only work for about a week. then they start to let the smell threw.

I haven't tryed this style yet, maybe I will try it next.

No the carbon stays dry at all times as with all carbon filters used to remove odor.

How you attach them depends on what your venting,i simple place these over my inline exhaust fans,then take a large hose clamp like the kind for radiator hoses in a car & tighten the clamp,that will hold it in place,works like a charm.

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My 4 day $40 bud dryer,http://www.rollitup.org/grow-room-de...ml#post2087235My DIY $3 Carbon filter,http://www.rollitup.org/grow-room-de...on-filter.html

I know you can,ive bought Activated Carbon from Walmart before,its in the fish supplies,the Scotch Brite cloth is in house cleaning supplies.

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My 4 day $40 bud dryer,http://www.rollitup.org/grow-room-de...ml#post2087235My DIY $3 Carbon filter,http://www.rollitup.org/grow-room-de...on-filter.html

The 2 in the picture are 6x10,you can also make them 12x10 by just folding the Scotch Brite in half before sewing it shut,the 2 small filters in the pic are from a Cloth that was cut in half.

You could even sew two cloth's together & make a massive 12x20 filter,the Scotch Brite cloth's are 12x20 in size without any folds.

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My 4 day $40 bud dryer,http://www.rollitup.org/grow-room-de...ml#post2087235My DIY $3 Carbon filter,http://www.rollitup.org/grow-room-de...on-filter.html

If they start to release odor all you need to do is lay them flat on the ground,out a towel over them,then lightly smash up the carbon with a hammer,they will last a long time,after their wore out you just cut open a little spot where you stiched it up at,dump out the old carbon,refill & restitch.

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My 4 day $40 bud dryer,http://www.rollitup.org/grow-room-de...ml#post2087235My DIY $3 Carbon filter,http://www.rollitup.org/grow-room-de...on-filter.html

sweet idea... maybe stuff 1 or 2 inside the end of a flexible exhaust hose...