Keeping humidifier water clean

Nan's NookArchives : Grow Chambers : Projects : Humidifier Tek : Keeping humidifier water clean
  Subtopic Posts Updated Creator
Iodine in humidifiers -    
Purified Water  -    
Peroxide, H2O2  -    
Add peroxide to H2O in humidifier?  5 12/20 01:52pm Ryan Waters

By Regular Expression (Xeger) on Wednesday, October 31, 2001 - 01:51 am:

Since losing two cakes to contams I've gotten a lot more strict about cleanliness. I've been replacing the ultrasonic humidifier water every 3 days, so it doesn't stagnate, and I'm thinking of putting an H2O2 / H2O solution into the humidifier. Does anybody know what concentration of H2O2 to use? I'm thinking 10% H2O2 to 90% distilled water.

By Regular Expression (Xeger) on Wednesday, October 31, 2001 - 01:54 am:

To clarify--I would use 9 parts of distilled water to 1 part of 3% H2O2 solution, the kind you get off a drug store shelf. Bringing the total concentration of H2O2 in the water to 0.3%

By Nan (Nanook) on Wednesday, October 31, 2001 - 02:02 am:

I would think that would work OK, but simply changing the water every three days and rinsing the tank and pickup with scalding water should be enough.

By relic (Relic) on Wednesday, October 31, 2001 - 05:31 am:

something to keep in mind if your using an ultrasonic is that, if the environment is too humid you're more likely to get contams as well. i don't know if this is the case with you but it can be a problem with ultrasonics.

By Brettiejams (Brettiejams) on Wednesday, October 31, 2001 - 05:32 am:

The little vapor making gizmo on those things(ultrasonic humidifiers) get coated with stuff quick if you don't use Distilled Water.... I don't know if the peroxide would leave deposits or not....I guess you're gonna find out.

I'd keep an eye on that though

By Nan (Nanook) on Wednesday, October 31, 2001 - 05:47 am:

I have checked this, Peroxide is made with distilled water to USP purity standards... No deposits.

By yagshroom (Yagshroom) on Saturday, November 17, 2001 - 10:04 pm:

A FOAF added 16 oz. of H2O2 to his 2 gallon ultrasonic humidifier tank, which brings the concentration of H2O2 to about .2%... this is seeming to work very well, and completely got rid of a small patch of cobweb mold in one day. I am sure that it is keeping the whole tubing system very sterile too. It doesn't seem to have had any bad effect on the mycelium. On another note, ultrasonic humifiers, because of the way they work, have inherently sterile water in the evaporation tub -not the actual tank- because of the ultrasound that is used to atomize the water in the bottom tub... it will destroy any microbes or spores in the water. Ultrasound is used in a number of different pieces of sterilization equipment, most of which are ultrasonic tubs that disenfect by basically popping the little creatures with sound. The .2% H2O2 solution in the tank will take care of anything living in there too. All in all, I would say that a bottle of H2O2 per tank of distilled water when used in any humidifier period, is a very good idea.

By Joe Mamma (Madscientist) on Sunday, December 23, 2001 - 05:42 am:

Anyone have a way of making a larger supply tank for an ultrasonic humidifier? I tried attaching a tube to a pipe fitting that I attached in the top of the tank. I ran the line up to a five gallon bucket above the humidifier but the water overflowed out the bottom of the tank. I think I need a physics lesson here.

By quote: (Quote) on Sunday, December 23, 2001 - 04:06 pm:

you need a float valve like a toilet uses to turn water on/off as water level drops.

By JCLAYMC (Jclaymc) on Sunday, December 23, 2001 - 09:16 pm:

This is something I have been thinkin about lately. You could drill small holes in the very bottom of your humidifier then put your humidifier in a large bin and run air tight duct from the wall of the bin to the air intake of your humidifier. You can cut a hole in the lid of the bin and run it into your grow chamber.
Just fill the bin up to the fill level of your humidifier. This should give you much more space for water.

By JCLAYMC (Jclaymc) on Sunday, December 23, 2001 - 10:27 pm:

oh I just went back and read your post again. I thought you were using a cool mist. My bad.

 Adding Beach To Your Humidifier Water ?

Posted by: OZZ Dec 24 02, 03:19 PM GMT
Good idea or No ??? IF so how much do you think would be appropriate ?? I was thinking of adding like 10 cc's to each gallon of water I added to the humidifier that Ill be using for my greenhouse. What do you think ? To much ? To little ??

Posted by: Mycota Dec 24 02, 03:41 PM GMT
I just add a squirt of 3% hydrogen peroxide when I refill them. That works fine. I don't know about adding bleach?

One thing I do know. It pays, to every now & again. Disconnect your hummers & give the inner workings, a GOOD cleaning & disinfecting, just to be one the safe side. It PAYS OFF.

How I know this is: I had a run of contams, on cased substrates. It boggled my mind, where the suckers were coming from. As all was done right, plus the room was positive pressure hepa filtred and / also internal hepa filtered.

Turns out, the weak link in the system, was the hummers. A contam got in one ( I assume in the water refill or when I was refilling it) & the hummer spread it.

From then on, I just added a squirt of hydrogen peroxide, with each refill and / also set a scedule up, to disinfect the hummers, once every 3 weeks.

That resolved that contam issue.


Posted by: OZZ Dec 24 02, 03:52 PM GMT
Ya I had thought of peroxide and I realize it works for you but for some reason I just dont trust it. Something about bleach that just makes me feel better, everything just seems cleaner ... could be all in my head and who knows ... maybe its TOO harsh but I know that when I had some cobweb break out on a casing, I used 6 cc's of bleach in 32 OZ of water and did a daily misting on it and the cobweb actually went away long enough for me to get another two flushes from it !! So if it didnt hurt the mycelium being diluted that much and sprayed directly on a casing, I would think I could add 10 cc's to a gallon of distilled water to put in the hummer. Hopefully ??

Thanks for the input but peroxide just hasnt won my trust I guess unsure.gif unsure.gif

To each his own for sure .. JMO

Posted by: Nanook Dec 24 02, 08:34 PM GMT
Peroxide is not going to hurt anything and it certainly helps against "slime" molds and bacteria (like the stuff that causes wet spot) that typically infest humidifiers.

Posted by: DirtyWOP Dec 25 02, 08:19 AM GMT
You don't trust peroxide, but you trust bleach?

Posted by: OZZ Dec 25 02, 08:47 AM GMT
Well Im sure I should reconsider .... I guess I may have just used the wrong choice of words .... how about this .. I feel safer with bleach. Thats all smile.gif Ill reconsider my thinking smile.gif !!!!!

Posted by: Smerd Dec 27 02, 09:25 AM GMT
I've used 1:200 bleach-water in the perlite base of my terra. It works fine. I think 1:200 is about 1 and 1/2 tablespoons per gallon. Peroxide's probably safer, but the bleach water's worked so far.

Posted by: Fungusmaximus Dec 27 02, 11:35 AM GMT
You want to see what bleach will do to your humidifier? Ill snap ya some pics?
It corrodes ALL metal surfaces in no time sad.gif
And peroxide dosent get the job done for me, shit, I always end up w/ mycelium growing in the water around harvest time. Which means the filter nor the h2o2 is doing its job. I think the peroxide is only good for about two- three days.
I took some of Nan's advice a while back, and added
tinc. of iodine, a couple drops per gallon, and I havent seen anything grow in there since smile.gif

Posted by: 420M Dec 28 02, 12:22 AM GMT
Yeah - at least with a hydro operation - when you add 35% H202 to the nute water - you have to do it every two days for best results.


Posted by: Nanook Dec 28 02, 12:36 AM GMT
Yes every 2-3 days, H2O2 breaks down quickly and turns into plain water. Iodine is much more persistent and in aqueous solution it does not take but a drop or two of tincture to get microbe control.