Quote Originally Posted by bigsby
pH Down will lower the pH of the of the water but it will take quite some time to flush a soil based pH issue. You want to dial in the soil pH from the start such that when you add properly pH adjusted water the overall pH stays stable. pH down is only meant to fix the water so that pH does not change within the grow medium. It will not fix the grow medium, especially given the added lime which will take time to breakdown and flush.

If the soil pH is wildly out of wack then you should consider re-potting with soil that is appropriate.
Ah that explains it. Is ph 7.5-8 pretty bad for the plant then?