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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Bartovation

Product ID: 280483540

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Details

Brand
Bartovation
Recommended uses for product
Drinking Water
Unit count
100 Strip
Manufacturer
Bartovation
UPC
643845994921

💧Detects residual peroxides

⏱️Results in seconds

🇺🇸Proudly made in the USA

Description

💦 Stay Safe, Stay Smart with Bartovation!

USER FRIENDLY - Simple to use, just dip and read!
QUICK DETECTION - Get results in seconds for peace of mind.
QUALITY ASSURANCE - Manufactured in the USA for reliability.
VERSATILE APPLICATION - Perfect for drinking water, pools, and hot tubs.
WIDE CALIBRATION RANGE - Accurate readings from 0 to 100 ppm.

Bartovation Hydrogen Peroxide H2O2 Test Strips provide a quick and reliable way to detect residual peroxides in various water sources. With a calibration range of 0-100 ppm and results in seconds, these strips are essential for ensuring safe water quality in drinking, pools, and hot tubs. Each vial contains 100 strips, proudly made in the USA.

Specifications

Manufacturer	Bartovation
Part number	PPX02V100-ML
Item Weight	41 g
Package Dimensions	8.41 x 4.19 x 3.61 cm; 41 g
Manufacturer reference	PPX02V100-ML
Item Package Quantity	100
Batteries Included?	No
Batteries Required?	No

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