The Ultimate Odour Control Thread

[The Gator]

@ Gator mixing ozone with carbon fitration can be dangerous: CO gaz is created and carbon can heat up till burning.
wouldn't advize so...

Speedganga thanks for your post, I understand your concerns and I have some additional information for you.

You make two points in your post about reactivity with carbon and ozone. You are right in the sense that there is a reaction between carbon and ozone but the results of the reaction are different from the results that you mentioned.

When carbon and ozone react there is no heat created. Ozone is highly unstable molecule that has 3 oxygen atoms, hence the O3 as the scientific representation. These three oxygen molecules are not connected very well and will easily break themselves apart and attach to other molecules. This is why it is so fantastic at removing odor, and also why carbon is so great at capturing it. When O3 and carbon meet it oxidizes the carbon and breaks itself apart, which causes two results. One is that it helps to slightly reactivate the carbon and open up micro pores, which helps to actually increase your carbon life span. Second is that once this oxidization occurs O2 is released, and it is just simple oxygen at that point, no longer a hyper reactive and unstable O3 molecule.

I have a great paper here from Berkley National Labs. They did a study on how well economy HVAC filters impregnated with activated carbon remove ozone. The filters in hydroponics are many times better and have way more carbon than these filters, but you can get a great idea of how well carbon removes ozone. http://www.osti.gov/scitech/servlets/purl/1050670

Please feel free to post any other questions or concerns you may have, im always happy to help in any way.

 

[mike myers mask]

obsolete sticky man, weed is legal now

 

[texasjack]

obsolete sticky man, weed is legal now

I wish

 

[bellcore]

Weed is still not legal in most of the world. Where it is legal you can face fines and worse for cannabis grow odors. You also face scrutiny and stigma from the neighbors and community.
EDIT: and probably attract thieves.

 

[autolockguy13]

forgive me if this seems a foolish question but im trying to work with what i have on hand... i currently have a 4x8x7 tent up and running with a 6" vented hood, 6" fan, and roughly 15' combined between the light/fan/window. at this point my tent has negative pressure and i get no smells in the house but im not to the stinky stage yet. this is where it gets a bit confusing for me as to how to do this with what i have... i have currently and would like to utilize another 6' vented hood, a can 33 filter, and a 4" fan. my fans are can fans btw. heres what i was thinking and please enlighten me if theres a better way. put the filter on the floor, 6" flex vent to light 1,6" flex rigged up to 4" fan, then on to light 2, flex duct to 6" fan and then more duct to window. anyone confused? my thoughts are that the 6" fan alone with 2 hoods and filter and ducting wouldnt be enough so try to use the 4" fan as a booster essentially. thoughts? thanks guys!

 

[fssalaska]

can lite 8x40 and 10x40 filters are fucking awesome !

 

[The Gator]

forgive me if this seems a foolish question but im trying to work with what i have on hand... i currently have a 4x8x7 tent up and running with a 6" vented hood, 6" fan, and roughly 15' combined between the light/fan/window. at this point my tent has negative pressure and i get no smells in the house but im not to the stinky stage yet. this is where it gets a bit confusing for me as to how to do this with what i have... i have currently and would like to utilize another 6' vented hood, a can 33 filter, and a 4" fan. my fans are can fans btw. heres what i was thinking and please enlighten me if theres a better way. put the filter on the floor, 6" flex vent to light 1,6" flex rigged up to 4" fan, then on to light 2, flex duct to 6" fan and then more duct to window. anyone confused? my thoughts are that the 6" fan alone with 2 hoods and filter and ducting wouldnt be enough so try to use the 4" fan as a booster essentially. thoughts? thanks guys!

If your 6" fan can put out more than 200CFM you will be fine. I just ran some quick math and you need around 180CFM to effectively exchange the air in your room every 3 minutes. The Can 33 is rated to be perfect at 232 CFM so if you run 200CFM you will increase your contact time on your filter and increase its efficiency as well. So that 4" fan should not be needed at all. The only thing that can cause a problem is if you have an intake fan, which it doesn't sound like you do.

 

[autolockguy13]

i believe the 6" fan is rated at 270 cfm. as far as intake, i have 2, 6" passive intakes, one on each side of the tent. with the losses in air flow from going through the filter, lights and ducting the single 6" fan should be enough? i appreciate the advice!

 

[The Gator]

i believe the 6" fan is rated at 270 cfm. as far as intake, i have 2, 6" passive intakes, one on each side of the tent. with the losses in air flow from going through the filter, lights and ducting the single 6" fan should be enough? i appreciate the advice!

Yup you should be fine. Even adding a couple more lights and a a few more feet of duct you should still be ok with your 6" fan. Just dont add too many 90 degree bends, that starts to really impact your airflow and could affect how well your negative pressure is maintained

 

[DarthBlazeAnthony]

The smell is minimal with this product. Exhausting the air outside with a carbon filter. Cheers.

 

[Voidling]

Granted this is probably slanted by someone selling ozone, they are writing scientific studies. It comments about short cycles continuously in the home as well as studies of adding it to office buildings and schools.

http://ezinearticles.com/?Proper-Use-of-Shock-Treatment-Ozone-Generators-Can-Save-You-a-Trip-to-the-Doctor&id=4368920

 

[GrowGlow]

Odour control


So you want to know about odour control in the grow room.
This is just a list of the things you can use to control the odour.
You've got to realise before you start growing that your ganja is going to smell.

(If you live in a house with your parents, you best just wait it out till you get your own place. )

Here is a compiled list of helpful information to help you learn the knowledge that will help you to become a good grower.

If you feel you can contribute, then post!

The carbon filter.

​

Taken from wikipedia -
​

"Carbon filtering is a method of filtering that uses a piece of activated carbon to remove contaminants and impurities, utilizing chemical adsorption. Each piece of carbon is designed to provide a large section of surface area, in order to allow contaminants the most possible exposure to the filter media."

A carbon filter works by removing "the smell" from the air that passes through it.
Place a fan so that it's blowing (or pulling ) air through a carbon filter/scrubber.
It's that simple!
You can buy them from most good Hydroponic stores, as well as online. (eBay etc.)


The most common questions asked when anyone talks about a carbon filter is the following :
Can't i get it cheaper than in the store?

The answer is YES!


DIY Carbon filters

Below is a list of links to useful DIY carbon filters that people have made themselves.
Remember these are tried and tested and the people who have made them swear they work well for their needs.
( Just remember to take into account that your needs may be different. )

I will be updating this list as more are found/made.

https://www.rollitup.org/do-yourself/58871-2-minute-cheap-easy-carbon.html
By MalteseGrower.

https://www.rollitup.org/grow-room-design-setup/63004-my-3-carbon-filter.html
By panhead.

https://www.rollitup.org/do-yourself/89078-diy-carbon-filter.html
by RandyRocket.

https://www.rollitup.org/indoor-growing/7074-easy-build-diy-carbon-filter.html
Found by MightyBuddha.

https://www.rollitup.org/do-yourself/75657-23-activated-carbon-scrubber.html
By DrGreenFinger

https://www.rollitup.org/grow-room-design-setup/80712-pc-fan-respirator-filter-works.html
by xKaminAx
(Works in a similar way.)

Links to other websites.

International Cannagraphic Magazine Forums - DIY pro style carbon filter

International Cannagraphic Magazine Forums - Simple Scrubber

International Cannagraphic Magazine Forums - DIY - Build a Carbon Scrubber For Dummies!

International Cannagraphic Magazine Forums - Panasonic Whisper Fan Carbon Scrubber Tutorial: Quietest most efficient fan ever!

International Cannagraphic Magazine Forums - micro carbon scrubber

International Cannagraphic Magazine Forums - $30 DIY Carbon Filter (Design by Ryoko)

International Cannagraphic Magazine Forums - hepa filter to carbon scrubber for 20 bucks

International Cannagraphic Magazine Forums - DIY Carbon scrubber.


ONA gel.

( Taken from ONA Gel odor neutralizer from 4 hydroponics.com by Growco Indoor Garden Supply. )

"Two odors can offset one another when they combine to form a bond. ONA's ingredients come from a blend of 32 essential oils and plant-derived compounds, that bond with and neutralize a wide array of pesky odors.

ONA odor neutralizer was originally developed for industrial applications to neutralize the strong odors in sewage treatment plants, rendering plants and chemical plants. If it can handle those conditions, think what it can do for you!"

ONA gel works by "killing" the smell.
( used in a grow room on a regular cycle. )



Hopefully this will stop a lot of questions asking the same things.
I started this to get the ball rolling.
I know a lot is missing.

If you feel you can contribute, then post!


Please post all odour questions in the thread linked below.

https://www.rollitup.org/indoor-growing/90892-odour-questions.html#post1065727

​

Has anyone heard of skunk be gone charcoal filter bags? That is what I use works great for me. I use 3 in a 120 square foot space.

 

[Voidling]

Just hanging loose?

 

[SamsonsRiddle]

Has anyone heard of skunk be gone charcoal filter bags? That is what I use works great for me. I use 3 in a 120 square foot space.

Where do you find these at?

 

[IHalveKnownAim]

Here's a link that has a ton of industrial strength ionizers for sale. http://industrial2equipment.net/Cleanroom-Equipment-&-Supplies-Ionizing-Blower/

 

[Voidling]

Here's a link that has a ton of industrial strength ionizers for sale. http://industrial2equipment.net/Cleanroom-Equipment-&-Supplies-Ionizing-Blower/

Are there parts you have to replace on the ionizers? They're safe to run with people so better than my ozone generator. I think so anyway. Do you know how well they work for a grow?

 

[IHalveKnownAim]

Some have filters and some do not. I have an older Dynastat model that I diy'd an intake filter using scraps o f regular ac filters. These ionizers are safe for people and pets. I can tell you that they're great at knocking down smoke. I don't know how effective they'd be for really large grows but I feel confident enough to use mine in the small cabinet that I'm setting up.

 

[BobCajun]

The smell is minimal with this product. Exhausting the air outside with a carbon filter. Cheers.
View attachment 3466916

I read where somebody posted that if you put Ona in your grow space the smell will be absorbed into the buds and make them taste like Ona. It's not going to neutralize weed odor anyway because Ona is a mixture of terpenes and terpenes is exactly what makes weed smell. Terpenes can neutralize other odor compounds but I don't think they can neutralize other terpenes. It would just be covering the weed smell with Ona smell. Far as I know, the only ways to get rid of terpenes is carbon or oxidation. I wonder what would happen if you passed the air through a bed of those white oxy crystals, calcium percarbonate. Would it oxidize them at all? Probably not but maybe some. Too bad a catalytic converter requires temps of 3-400 degrees C.

 

[Cl@rksville]

A rough guide is a 1200 cubic metres/hour fan for a 0.036m3 volume of carbon with the air drawn through an internal chamber of the equivalent volume, so basically a lined cylinder. Believe me for a home made system you would need to do a fair amount of work and buy around 40 litres of carbon too! Well 36 but its sold in 50's in the main... its cheap enough but buy from a reputable seller! This picture is a stripped down Rhino which I made far better after changing the carbon second time around with a few extra bits!

Dumping 36 Litres of carbon in a bucket, drilling its base full of holes and whacking a 1200 m3/h fan on top doesn't work for air flow but as a totally independent odour eliminator where air exchange doesn't get effected its better than any Rhino!!! If you have a 600 m3/h fan then use 18 litres etc.

We have to use a new equation for this 'bucket' method if you want the air to drawn out and away as you now have a different shape, a block not a cylinder! It will be just as effective but less efficient because you would actually need a 3600 m3/h fan to draw through the 36 litres of carbon at an effective rate... or 1800 m3/h for 18 litres etc.

You can also add fragranced washing crystals such as the ones from P&G in the UK but wouldn't know about anywhere else. I use the Downy Unstopables from Asda which last for ages in my DIY filters.

 

[DarthBlazeAnthony]

A rough guide is a 1200 cubic metres/hour fan for a 0.036m3 volume of carbon with the air drawn through an internal chamber of the equivalent volume, so basically a lined cylinder. Believe me for a home made system you would need to do a fair amount of work and buy around 40 litres of carbon too! Well 36 but its sold in 50's in the main... its cheap enough but buy from a reputable seller! This picture is a stripped down Rhino which I made far better after changing the carbon second time around with a few extra bits!View attachment 3517551

Dumping 36 Litres of carbon in a bucket, drilling its base full of holes and whacking a 1200 m3/h fan on top doesn't work for air flow but as a totally independent odour eliminator where air exchange doesn't get effected its better than any Rhino!!! If you have a 600 m3/h fan then use 18 litres etc.

We have to use a new equation for this 'bucket' method if you want the air to drawn out and away as you now have a different shape, a block not a cylinder! It will be just as effective but less efficient because you would actually need a 3600 m3/h fan to draw through the 36 litres of carbon at an effective rate... or 1800 m3/h for 18 litres etc.

You can also add fragranced washing crystals such as the ones from P&G in the UK but wouldn't know about anywhere else. I use the Downy Unstopables from Asda which last for ages in my DIY filters.

Miniaturize it and I am in

A rough guide is a 1200 cubic metres/hour fan for a 0.036m3 volume of carbon with the air drawn through an internal chamber of the equivalent volume, so basically a lined cylinder. Believe me for a home made system you would need to do a fair amount of work and buy around 40 litres of carbon too! Well 36 but its sold in 50's in the main... its cheap enough but buy from a reputable seller! This picture is a stripped down Rhino which I made far better after changing the carbon second time around with a few extra bits!View attachment 3517551

Dumping 36 Litres of carbon in a bucket, drilling its base full of holes and whacking a 1200 m3/h fan on top doesn't work for air flow but as a totally independent odour eliminator where air exchange doesn't get effected its better than any Rhino!!! If you have a 600 m3/h fan then use 18 litres etc.

We have to use a new equation for this 'bucket' method if you want the air to drawn out and away as you now have a different shape, a block not a cylinder! It will be just as effective but less efficient because you would actually need a 3600 m3/h fan to draw through the 36 litres of carbon at an effective rate... or 1800 m3/h for 18 litres etc.

You can also add fragranced washing crystals such as the ones from P&G in the UK but wouldn't know about anywhere else. I use the Downy Unstopables from Asda which last for ages in my DIY filters.