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In your Hydroponics Garden, I avoid using hydrogen peroxide you commonly find at drug stores. This is because such low percentage (3%) solutions are unstable, and chemicals are added to the peroxide to keep it from breaking down before it can be used. I did a little research because I did not know what chemicals were used for this, or if the plants uptake these chemicals, or if there was a health risk associated with any of these stabilizing chemicals.
Hydrogen peroxide is usually stabilized with acetanilide. Acetanilide is a synthetic compound that was first used for its fever reduction and pain killing properties in the late Nineteenth Century. For many years it was utilized as an alternative to aspirin to treat various ailments, but large scale medical use stopped when the toxic side effects of consuming acetanilide became apparant. This was enough to convince me to use 35% hydrogen peroxide instead.
Using 35% Hydrogen Peroxide
In your Hydroponics GardenFirstly, 35% peroxide is caustic and should be treated with the same caution as a strong acid. 35% strength hydrogen peroxide is readily available at our store. The stronger concentrations do not use the added stabilizers.
The recommended dosage is to add 2-3 ml to each gallon of water, however, I use 5 ml per gallon and have never had any problems. At every nutrient change treat your fresh water using hydrogen peroxide. The general idea is to let the hydroponics system circulate the hydrogen peroxide solution for about a half hour to let the peroxide work against pathogens and to let the solution stabilize before adding your nutrients.
The beneficial effects of using hydrogen peroxide last about 4 days. There are some gardeners who add a little peroxide to their nutrient reservoirs every 5 days in between nutrient changes. If you decide to do this, stick to the guidelines and always make sure your solution is thoroughly mixed before exposing your plants roots to it. Another option is to top off your nutrient reservoir with peroxide treated water whenever it is low.