Use these test strips to fine tune the amount of Oxy Blast! or other peroxide product used in your hydro system.
The goal is to achieve 30ppm of peroxide in your nutrient solution - that amount will kill most of the dangerous pathogens and bacteria in your water and growing media without damaging the roots. The only way to do this is by using the Oxy Blast Peroxide Test Strips. Simply dip a strip in your nutrient solution for 1 second and compare the color to the swatch (included). If it's too light in color, you need to add more Oxy Blast! (or other brand of food-grade peroxide solution). BGH recommends purchasing 3-5 strips - once you dial it in and know how much Oxy Blast! to use each time, you won't need the strips anymore.
NOTE: Oxy Blast Test Strips are sold by the strip; the photograph is only for illustrative purposes.