I have used it to clean up the water.

I put in much more than they say to without ill effects...

I use the 3% bottles from the drug store. It can get expensive, however.

i also have the air bubblers.

Scott

Scott,

How much do you use? I.e, tablespoons per gallon?

i use it to kill algae, i use about 1/2 cup-1 cup in 6 gallons of water. i use a higher concentration in my dorm room hydroponic system. i have yet to "overdose" my plants. MAKE SURE: you are using 3% NOT a higher concentration or you will burn you plants and your skin.
~Ryan

All municipal water systems with old piping have slime mold. H2O2 kills slime mold and lots of other stuff, including algae.

I use 4 tbsp/gal of water and let is sit for 4 hrs before I use it with plants. 500-1000 ppm is the recommended concentration of 3% solution.

Do you think it is safe to use a little H2O2 in a aerocloner? I'm thinking maybe one or two tablespoons per gallon?

i think its safe. ~Ryan

How long does the "algae killing" effect of the 3% peroxide last?

Is adding the peroxide something I do one time (unless I change the water), or do I need to repeat it now and then for routine maintenance of the system?

it is routine maintenance. i add it every 3-5 days. whenever i think of it. hydrogen peroxide is H2O2, that means it is water with an extra O1 attached. this oxygen is unstable and quickly breaks down into pure water and O2 gas. the O2 is where all the benifits come from and the "waste" is just plain water. you could add it as often as every 3-4 days or as infrequently as when you see algae growth. either way it is helpful. that's my $.02 ~Ryan (the only 18 y/o NOT using his hydroponics to grow pot)

Here is a link that might be useful: a few of ryan's hydroponics

Hi ed,

What kind of system are you using. I tried using H2O2 foodgrade (35%)at 100ppm everyday other day. It seems to work well under tagaytay condition in NFT (rectangular pvc). I though of it to control cercospora leaf spot in lettuce and there has been a big imporvement in the crop eversince. After every growing cycle, we clean the tank with it at 150ppm. You might wanna try it.

Thank you for referring people to us. Hope to see you again soon.

I keep a 5 gal reservoir of water treated at 500 ppm h2O2 for topping up nutrients.

I also treat water for reservoir change every 2 wks w/500 ppm and let it sit.

I do not treat operating reservoir, only the water I'm adding or changing and I have not had any pathogens in nutrients in 10 yrs.

I use about 9 tablespoons per gallon.

I would notice it would work for me for about 4 days or so.

How do you measure parts per million?

How much is 500 parts per million?
It is said to kill pythium but not when already in tissue. Then you need systemic fungicide. Of course I don't grow food crops so I dont' worry about it.

Scott

I have in my notes, an explanation made by Dr. Lynette Morgan from Growing Edge. I thought it is a very clear and simple explanation of PPM.

"1 part per million (ppm) is 1 milligrams (mg) per liter (l). Therefore, to calculate the amount of solid to dissolve in water, the ppm required is the amount in mg per l (mg/l); 1 mg=1/1000 grams (g)."

This is a very informative post. Would anyone who posted their comments care if I used it in the FAQ? If so, please post here or e-mail me. Thanks.