<https://www.simplexhealth.co.uk/product/watersafe-water-lead-test-kit-double/#product>
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"Lead in drinking water is mostly caused by lead pipes especially in houses built prior to the 1930s. The lead concentration is normally higher when the water is softer, ie. has a lower pH. When lead enters the body it can cause damage to the central nervous system as well as cause developmental harm especially in children and infants, neurological and kidney damage. Once lead has entered the body it is released very slowly, which means ongoing exposure will cause a build up of lead in the body.\r\n\r\nThe amount of lead in water caused by lead piping is greater when the water has been sitting in the pipe for a while, ie. in the first water of the morning. It is therefore important to let the water run to flush the pipe before using it. Because lead levels in the water can vary throughout the day, it is recommended to test your drinking water more than once - ideally throughout one day whenever you use your water for consumption.\r\n\r\nThe UK maximum contaminant level for Lead in tap water set by DWI/DEFRA is 10µg/l (= 0.01mg/l = 0.01ppm).\r\n\r\nSuitable for: fresh water samples, including water from taps, wells, springs, boreholes, ponds, as well as rain water\r\n\r\nSensitivity: presence/absence measured at a level of 15ppb (= 0.015 mg/l)\r\nThis test can detect lead at very low levels (15 ppb or one drop in a large swimming pool).\r\nWhen using the lead test kit, please use water that has been sitting in the pipe for a while (ie the first water in the morning). \r\nClick here to find out more about testing for lead in drinking water. Should lead be present, then there is also some advice on what you can do in the short term.\r\nContains: 2 tests\r\n\r\nTotal Test Time: approx. 10 minutes\r\n\r\nHow to Test:\r\n\r\nThe Watersafe Lead Test can detect dissolved lead at levels below the EPA Action level of 15 ppb (parts per billion)\r\n\r\n\r\n\r\n1. Open Lead packet and take out all contents. The foil packet contains a test vial, a dropper pipette, one test strip, and a desiccant (to be discarded).\r\n\r\n2. Using dropper, place water sample into test vial. To pick up the sample, tightly squeeze the bulb at the end of the dropper and place the open end into the water sample. Release the bulb to pick up the sample, then squeeze again to expel the sample into the vial. Use only one pipette-full of water.\r\n\r\n3. Swirl vial gently for several seconds. Place on a flat surface.\r\n\r\n4. Place test strip into the test vial, with arrows pointing DOWN.\r\n\r\n5. Wait 10 minutes. Do not disturb strips or vial during this time. Lines will appear on the strip.\r\n\r\n6. Take the strip out of the vial and read result.\r\n\r\n&amp;nbsp;\r\n\r\nNegative: Bottom line (next to number 1) is darker than the top line (next to number 2).\r\n\r\n\r\n\r\nPositive: Top line (next to number 2) is darker than the bottom line (next to number 1), or lines are equally dark.\r\n\r\n\r\n\r\n&amp;nbsp;\r\n\r\n&amp;nbsp;\r\n\r\nIf a test strip shows a positive result, your water sample may contain lead at a toxic level. Take appropriate action.\r\n\r\n&amp;nbsp;\r\n\r\n\r\n\r\nClick here to Learn more about Lead in Drinking Water and what immediate steps can be taken to reduce lead exposure.\r\n\r\nTo test the amount of lead in ppm (parts per million) in your water or body (using urine or saliva) then click here: Home Test Kit for Lead (range)\r\n\r\nPlease note, that Watersafe® is a screening test and can not be used to certify water as safe or unsafe for drinking. Watersafe® provides approximate results ONLY when used in strict accordance with instructions. SimplexHealth expressly disclaims any liability resulting from the use of this product, failure to follow instructions, or reliance of test results. ­This is not a measuring instrument.\r\n\r\nMade in USA"
<https://www.simplexhealth.co.uk/product/watersafe-water-lead-test-kit-double/>