For over 80 years the Diamond H2O family has been providing enhanced water solutions to it's customers, and will continue to be on the cutting edge of developing technologies while upholding a strong, committed family-oriented moral. We welcome you, and we are here to help.. Quality,innovative water softening,iron removal systems, filtration and reverse osmosis. Patented and Wisconsin State Certified systems to choose from. Safe Drinking Water Act Certified water tests in our on-site state certified lab.