get your ph up, I'd flush with a solution of 7.0 for 1 x the pot size then hit it with a 6.7 watering with 10% run off and Check the ph of run off and re calculate.
[h=2]Rough Calculation Guide:[/h] Here's some good info on ph.....
If your runoff pH is higher than your starting pH, use this equation to determine your soil pH:*
Soil pH = Runoff pH + Difference
If your runoff pH is lower than your starting pH, us this equation:
Soil pH = Runoff pH - Difference.
For example, say your the starting pH of your solution before it goes in is 6.5 and the pH of your runoff is 7.0. The difference is +0.5, so using the above equation:
Soil pH = 7.0 + 0.5*
Soil pH = 7.5
If your starting pH is 6.5 and your runoff is 6.0, your difference is -0.5 and using the above equation:
Soil pH = 6.0 - 0.5
Soil pH = 5.5
If you see the chart above at 5.5 in soil you are locking out a lot of needed nutrients......