ph water raising

  1. LEDRF

    PH weirdness question from an experienced grower

    So, I stumbled upon something I can't figure out. When I measure my well water, it is 7.0 ph. However, if I let it sit out for 12 hours or so, then test it again, it is 8.1 What could be in well water that it would buffer to 8.1? What is in well water that makes it 7.0 while in the...