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Old 08/30/2018, 06:27 PM   #2
RC Mod
Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 87,910
That's a tough question. In practice, I would run RO/DI, and make sure that the TDS was zero. There are a number of possible toxic contaminants in spring water, and it's not practical to test for them all, price-wise. Also, run-off might vary during the year, which could lead to varying parameters in the spring, depending on how it's fed.

Jonathan Bertoni
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