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Open the bottle and remove the seal.
Fill the bottle up to the neck with water.
Put the cap back on and shake vigorously until the powder dissolves.
After 48 hours, if the solution remains yellow, it means that the water is safe. If the solution turns green, it indicates the presence of bacteria.
Customer
August 25, 2025
Good product, works so well! Peace of mind!!
Professor Awesome
August 5, 2025
Easy to use. We tested our water twice after the flooding in North Carolina to make sure that our well was still safe to drink from.
Tego Venturi
June 14, 2025
I tested our well water with this as it had a funny smell. It was positive for bacteria. We treated it using online information, and retested a few days letter and it was all better.
pichi
June 7, 2025
Buen producto
picago
June 1, 2025
I was a tad leery buying these given a prior review had reported previously testing their water via a lab with positive coliform results and then had this test come back negative. Obviously, I don't want a false negative. I was in a similar situation: I already knew there was coliform detected in my well water via previous lab testing. And since I recently installed a UV filter, I needed to test its effectiveness. The time and cost of sending samples to a lab isn't ideal so I decided to give them a chance.I tested both straight out of the well (which I knew had coliform) and out of the tap (which had gone through UV filtration) as well as my RO/DI water for the heck of it. Indeed, after 48 hours, all three samples were yellow in color. Knowing that my home environment didn't quite meet the instruction's call for keeping samples between 68-90 degrees and also knowing that bacteria needs warmth/time to grow properly, I decided to give it another 24 hours. It took only 12 hours, however, for the well water sample to completely switch colors and is now showing positive results.Long story short, just beware that the temp requirements are there for a reason and if you can't quite meet them, give the samples more time. I know I'll personally be giving them an extra 12 hours regardless of temp just in case.
David J. Eyre
May 19, 2025
Our water source is influenced by ground water which requires frequent testing to make sure it is free of contaminants. While some local labs charge $40 to test water, these tests (6 per box) bring the cost down to only $6 per test.
Vc
May 2, 2025
These were easy to follow directions & appeared to be accurate in the colors to determine if there’s bacteria in the water
Kevin Kling
November 16, 2024
Didn't get 3rd party testing done to confirm but it came up as good and we have been drinking our well water without issues.
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