Quote:
Originally Posted by RoyalOrchids
Pure water has no pH buffering minerals so even small amounts of a weak acid (or base) can cause a pronounced change in pH. You could use a different water source and ST wouldn't have that big of an effect - but I'm sure you'd rather stick to RO and just keep adjusting it.
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Great point- I might have mentioned that I have to do this often in my fish tanks, and it's very easy to over-compensate when playing with pH- which speaks to how easy it can be changed in some cases.
I'm still not taking a side on whether ST is the problem here though. Just don't know enough about it.
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