481195-30- ***Direct from the Manufacturer - USA*** WaterWorks Bacteria Growth Check #481195-30 CONTAINS 1 PACKET OF 30 TEST STRIP FOR DETECTING BACTERIA LEVELS IN WATER. WaterWorks Bacteria Growth Check is an easy, efficient way to detect bacteria presence in water. Simple dip the testing pad into your water sample, place it back in the package, and leave it undisturbed for 48 at room temperature. Once done, match the pattern to the pattern matching chart included. For surfaces, add deionized/distilled water and swab. The test works by developing growth colonies on the test strip pad. Ideal for home testing and safe to use for classroom demonstrations. No harsh external chemicals required. Detects: 10^4, >10^6, >10^9 Bacteria/mL.