Do chemical qualities like alkilinity and PH change over time? I'm talking about from a practical standpoint.
Can I assume (dangerous I know) that it should be OK to send samples of my water to a testing lab, get the results and bet that they won't change unless I do something chemically to alter it?
If it can or does change, what other than my meddling can cause the change? What do I really need to watch for? How can I screw up a good deal?
