I have not been able to get my water ph to 6.5. The water will ph down to 7.4 range and then won't move any more. I tried water straight from well and I flushed washed dumped and retried multiple times with both crystals ph and liquid but same results with all efforts. I just used half the bottle of liquid ph down but it wasn't moving past 7.4 and I know I could dump the other half with no results. I used half the large crystal ph down same results. The water starts out in 10.-11. ph range and I can get it to 7.4 but it refuses to go any lower and I think it killed my plants using the water with that large amount of ph down in the water. So I can't even flush my plants , I did flush them with the hose 11. ph water after the use of over dosed ph water, the plants seem to want a clean proper ph flush but I can't provide it and they just keep getting worse. I have no idea what to do. water won't ph down any lower than 7.4 issue. and that takes excessive amounts of ph down. to get to 7.4, then adding more and more does nothing.