Mag-Erad Non-Toxic Cleaner for Water Heaters - 1 Lb
Although a little pricey, the product works well. We have 3, 100 gallon commercial water heaters. We de-lime them every 3 months, with Mag-Erad. At the cost of the Mag-Erad, this prevention is a toss up at best. The water heaters cost $2,100 new. If they last 3 years, the cost of the Mag-Erad every 3 months, will cost more than a new water heater.