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Re: RO and pH

Bill asked about RO and pH, and about marine mix and GH &

1. Yes, RO can and commonly does affect pH.  Multiple
factors involved there, it is not a simple relationship. 
The larger factors will be the input water parameters and
the rejection rate - is the unit being run with high
rejection on high KH water? If so the pH effect will be
marked.  The output water from high-rejection processing,
having significant reduction in KH, will also be more
strongly affected by atmospheric CO2, having lost much of
its natural buffering. 

2. Yes, synthetic sea salt mixes will include substantial Ca
and Mg as well as carbonates and bicarbonates, so both GH
and KH  (and pH) will be increased, dose-dependent.