Rootman Plumbing Contractors

I am a licensed plumbing contractor who follows a real estate developer. The developer installs 40 gallon AO smith tanks in these units, all electric. I purchased 5 units from Amazon at his request for tank corrosion protection testing. After 1 year of, water tank tec was the only unit that maintained the voltage and current to the anode. 2 of the units were dead, and ironically the highest price unit was the worst. 3 of them leaked although the green light was lit. I don’t have the time to contact anyone that sells a product that fails in 1 year for a replacement when all of their products failed. I purchase around 300 units from water tank tec a month. This product works for me and I do recommend it.