pretty sure you have ghosts
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I ran my well water through my charcoal filter, then set it out in the open, room temp 76. Ph started at 7.1, and 15 hours later, it is 7.6. It didn't rise as high as the well water when not ran through the filter, but still, enough that I am going to buy an R/O filter system.
I don't see the need to get the water tested as I will be drinking R/O water now, and so will my plants.
Brick, her issue isn't adjusting the Ph. It's a wild swing of Ph over a 24 hour period, sliding towards the base end, of a whole Ph factor. Since it is well water, that is the reason the filtering and water testing was recommended, as it can be contaminants.
Sounds awesome. However, I still would consider the testing of the well. Even if you switch all drinking and plant watering to the RO system, you are still bathing in it, washing clothes in it, and washing your body in it. If it's got something hinkey in it, it's good to know just what it is you've got.
I know it isn't a grow issue now, since you have an RO filter, but if it was me, I'd get it checked merely as a safety issue. However, if anything, this is a good thing. At least now you KNOW there's something wrong with the water. It's just a matter of what it is.