An old grow buddy named Major Tom gave me this article, written by Ed Rosenthal.


When and how much hydrogen peroxide should I use in my hydroponic solution?

Hydrogen peroxide is a powerful oxidizer that can be used to destroy fungi, molds, bacteria and other infectious agents as well as some pollutants. Adding it to your water helps plants by destroying infectious agents and by adding oxygen to the roots' environment.
Hydrogen peroxide is an essential ingredient in maintaining a clean growing room. It replaces chlorine bleach, which is antiseptic but harmful to breathe. When added to reservoirs, hydrogen peroxide slows the growth of algae and other water organisms so that trays and utensils need to be cleaned less frequently. Soil and water borne diseases such as pythium and other stem and root rots occur at much lower rates in hydrogen peroxide-enriched water. Hydrogen peroxide works because of the oxidative reaction, so micro-organisms are unlikely to develop a tolerance.
There are many ways to add hydrogen peroxide to the water. A measured amount every three days is the crudest method, but still effectively enriches the water. A smaller measured amount daily would even out the peaks and valleys of oxygen in the water. Another method is to use a drip similar to an IV bag, which continuously adds a regulated amount. The most sophisticated method is a probe which measures the oxygen content of the water as an indirect means of measuring the hydrogen peroxide, and adds an appropriate amount as needed.
When used properly, hydrogen peroxide can keep infections in the garden to a minimum and stimulate root growth by increasing the oxygen content of the water. Hydrogen peroxide degrades into free oxygen and water over a three-day period. Some of the oxygen dissolves in the reservoir water and is used by the roots.
Different concentrations of hydrogen peroxide solution are available. It is sold diluted to 3% in drug stores. Some indoor garden shops sell 10% grade and 35% grade is sold in a few health food stores and over the Internet. The 3% hydrogen peroxide solution can be used topically to sterilize cuts and infections. Hydrogen peroxide solution at 10% burns skin. 35% hydrogen peroxide solution acts much like a concentrated acid and is handled as a hazardous, corrosive liquid.
The 10% hydrogen peroxide solution is sometimes used at rates as low as one ounce per 10 gallons water; however, enrichment using an ounce per gallon is more effective for disease control. When 35% hydrogen peroxide solution is used, it can be added at the rate of three ounces per 10 gallons of water. If a 3% solution is used, use three ounces per gallon of water.
ZeroTol is a peroxide-based commercial sterilizing agent used in the greenhouse industry. Its active ingredient, HO2, also breaks down into oxygen and water, but it is even more active than 35% hydrogen peroxide. It is used at the rate of one part per 300, or three ounces per 10 gallons, for excellent prevention of diseases and infections. ZeroTol is available from Bio-Safe Systems in Connecticut (1-888-273-3088; www.biosafesystems.com) and through some other gardening supply stores.

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Roseman
When you grow with Mother Nature, you Grow with God.
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I add a little bit to my foliar spray to cut down on diseases. It doesn't seem to be harming the plants, but I don't have a control so I don't know if it reduces anything or not.

I also pour 3% hydrogen peroxide directly on my medium a few days before I plant anything in it, but again, it doesn't harm the plants, but I don't have a control. Just seemed like a good idea since peroxide is so cheap.

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Great Article, I Remember Reading It. I Like To Use The 3% & 35% h2o2, After Every Res. Change, I Refill The Res. PH It Then Add 3% & 35% h2o2 & Run It In The System On Regular Schedule For Around 48hrs Before Adding My Nut.'s & Supplement's.

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And NEVER mx it with bleach!

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Roseman
When you grow with Mother Nature, you Grow with God.
May Peace and Joy Be Your Companions.
[FONT=Arial]Ask me about DWC, CFLS, and Indoor Growing.

Having never used h2o2 before on plants, until I first started this endeavor. When you say it kills all bacteria and molds, then I assume this is not to be used on Organic grows where you are trying to raise a micro herd ?

These guys are using it for Hydro. In soil or mixed mediums it would be used as a treatment for root rot. Use to much and it will kill all the microbes, good and bad.I use D.M. Zone whenever the roots get more than 3 or 4 months old. It helps keep all those little critters happy too.

Since I posted the question Zigzag, I have been doing a little reading. Seems it has a bunch of different uses. At what rates would it be safe to apply when "trying" to be organic in my grow. Also D. M. zone ?

I've never purchased peroxide in anything but 3%. Hydro guys do so hopefully somebody will chime in about it's varied uses there. Zone is mixed supplement that promotes root growth and health, I use 1/4 teaspoon per Gall. with every feeding. Not on water only days.

Hey there, I use this and it is at 17,5% (so in case you use H2O2 at 35%, just use half of this dosis)
Liquid Oxygen









• Add to tank daily at the rate of