I have been building from grocery store bought RO for the last several batches. It's nice and cheap and gives me a better idea of my starting point. After reading HoosierBrew's suggestion on another thread, I also bought a cheap TDS meter. Have not brewed since I bought it though. My water softened tap water read somewhere in the 130 range though. Glad I'm using RO!So the RO reads what - let others know for comparison.
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