I'm with shake on this one,... looks like PH issues.

6.6 is a bit high, by my experience the FFOF soil will buffer it up about 1-1.3, so your soil runoff will be closer to 7.7-7.9. I have no clue if that's good bad or indifferent,... but I shoot for 6.0 inbound and haven't seen any problems with the 7.0 outbound.

Try and lower your inbound PH to 6.0 and don't bother testing outbound with "Color" test's, the soil particles and nutes will skew the results.


Thinking of which, I need to calibrate my pen.................