The WaterWorks™ Total Iron visual test for water quality testing detects ferric (Fe+3) as well as ferrous (Fe+2) forms of iron. This test makes accurate total iron testing easier and does not require a meter. Test results are quickly available in only 3 minutes after following a simple test procedure. WaterWorks™ Total Iron visual test offers an ideal testing method for ensuring drinking water has iron levels below the UDEPA recommended maximum contaminate level of 0.3 ppm. 50 powder packets.