It's MG organic, so the PH is naturally low. I am using PHup for fish tanks to adjust my water. My run off is test well bellow 6 (can't tell because 6 is as low as the chart reads) so I add a drop or 2 of PH up to a water bottle and it test bright blue (above 7.6 but not sure how high, because the chart tops out at 7.6) The last 2 or 3 waterings have been with this high PH water. The last watering was with 4 drops in one bottle, and the run off PH still reads under 6. Is this aquarium PH up just not strong enough? Everyone else seems to be able to control their PH with water that is around 6.8-7.0. Why is my 7.6+ not doing anything?