Manufacturers of espresso machines recommend RO water not be used unless re-mineralized. Some mineral content is needed for boiler sensors to function.
Installed as a post filter in my drinking water system. Noticed an improvement in taste. Brought my mineral content up to approx. 2 grains.
A knowledgeable employee at Lowe’s recommended SpectrePure to me years ago. I’m am so glad I found them. The products are far superior and the customer service of a family business is night and day compared to what we’re all used to. I hope that never changes. I’ll be a customer for life.