What would I use to test if 3% H2O2 is still potent?

3% is 30,000 ppm, so NOT these 0-100 ppm test strips! You need Very High Level 2-10% test strips, which are available on Amazon.

While this product be able to measure a 7% solution of hydrogen peroxide?

This product will not be able to measure that high of a level of hydrogen Peroxide. What you should get instead is the Bartovation Food Grade Time Sensitive Very High Level Hydrogen Peroxide (h2o2) Test Strips, up to 10% Concentration (ASIN: B01CDX4ZB6). Those strips will help you know if your solution is approximately 7% because it will give you a reading in between 5% and 10%. Please let us know if you have any more questions or if there is anything else I can help you with! Best, Scott

How do i test 35% food grade hydrogen peroxide with your test strips. what ppm would i read on the container. what would i read if i reduced the 35%?

This product is designed to test residual (low level) peroxide, so, although it could be used to test food grade hydrogen peroxide, it would require a very precise dilution ratio that would be hard to achieve accurately. For testing food grade peroxide, I recommend using our "very high level" strip (https://www.amazon.com/dp/B01CDX4ZB6), where you would: mix 1 part 35% peroxide solution with 2.5 parts water to yield a concentration of 10%. If the color change is not immediate, then the initial concentration was not 35% (or a mistake was made in the dilution). Try other dilutions to zero in on the actual strength, e.g. 1:6 should give you 5%; etc.

I bought these for my pool, after putting 5 gallon of 35% h2o2 in a 25000 gallon pool water, the strip turns black, what does that mean?

As far as I recall the amount needed is 1 cup peroxide for every 250 gallons. Black is probably way higher than shades of blue that can register on strip; probably over 100 ppm.

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🔵 Stay ahead of water safety—test fast, live smart!

VERSATILE USE - Perfect for drinking water, pools, and hot tubs—keep your environment pristine.
INSTANT CLARITY - Get precise peroxidant levels in just seconds—no waiting, no guesswork.
TRUSTED QUALITY - Manufactured in the USA with premium standards for reliable, consistent results.
VISUAL CONFIDENCE - Color-changing blue scale makes reading results effortless and foolproof.
BROAD DETECTION RANGE - Calibrated from 0 to 100 ppm for ultra-accurate monitoring of water safety.

This Hydrogen Peroxide H2O2 Test Strip Kit offers rapid, color-coded detection of residual peroxidants in water, calibrated across a wide 0-100 ppm range. Ideal for ensuring safe drinking water, pools, and hot tubs, it delivers reliable results in seconds and is proudly made in the USA.

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Manufacturer	Bartovation
Part number	PPX02V100-ML
Item Weight	132 g
Package Dimensions	15.01 x 10.49 x 4.7 cm; 132 g
Material	Hydrogen Peroxide H2O2
Batteries Included	No
Batteries Required?	No

Hydrogen Peroxide H2O2 0-100 ppm Test Strip Kit Low Level [3 100 Strips Each]

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