I originally went to RO because my tap water has a pH of about 7.6. I made
the switch before I put in the CO2. Never considered going back to tap
water.

pH stable claims to not contain phosphates. I do have a history of
higher-than-one-would-expect phosphates. I'll have to do some tests on my
reconstituted RO water and see if that could be the source.

"Ron Nelson" wrote in message
...

What is your tap water like? It seems like a lot of work rebuilding RO
unless there is something horribly wrong with your tap...

I'm not well versed in the ways of RO but I have read many times around
here about various PH buffers having phosphates (I personally don't know
if pH Stable is one of them???) and making ph/co2 relationships
inaccurate. Hopefully some more knowledgeable than myself will chime in
and help.

Ron