IQ.Bac UV check Water Test Kit -is an easy-to-use screening test that can quickly detect if your UV water disinfector or filtration system still works. It detects any bacteria or fungi that has managed to survive inactivation by UV, Ozone, or filtration, or any other chemical treatment (bleach, or other chemicals). UV disinfection systems have become the main mode of treatment for potable water, due to its convenience (no chemicals,relatively easy to install. The biggest challenge with these systems is finding out how effective a given system is in inactivating bacteria in a specific setup, as its effectiveness varies greatly with water flow, turbidity, age of the UV lamp and many other factors. iQBac is a smart and easy way to test how well your UV purification treatment is doing its job. Just collect a sample in the test vials and let it sit until the next day. The test will detect as few as ONE surviving bacterium of fungus per ml of sample within 48 hours incubation at room temperature. iQBac will give you the piece of mind that your water is clean and safe to drink. Technical specifications Detection limit: 1 CFU/ml Recommended sample volume: 5 ml Box Content: Each kit contains 4 iQBac UV Check test vials with yellow dry media and blue cap Instructions Jar height: 2.86 inch (72.5 mm) Cap diameter: 2.35 inch (60 mm) Jar weight: 0.009 lbs (40.8 g) Shelf life: 2 years (expiration date is indicated on the package) Store away from direct sunlight