The SenSafe® Water Metal Check can readily determine if your water has heavy metals present (Cadmium, Cobalt, Copper, Iron (ferrous), Lead, Mercury, Nickel, Zinc and other +2 valence metals). This quick test uses a very sensitive non-specific indicator that Detects many common heavy metals that can cause concern. The heavy metal test should read <10 ppb; this confirms that your system is functioning properly when testing filtered water. Additionally, bottled water should read <10 ppb. Note: This test is meant to be a screening tool and will NOT specify levels of each metal present, only total +2 metal content.