Hey there TRIPDOG,
Just been on the Dutch Pro website and taken a screenshot of their soil feeding schedule which is somewhat different from the one you appear to have been using. Was your chart supplied to you with your nutrients? If so, I think it may well be out of date! If you look there is no difference in the amounts of recommended nutrients per litre (ok, they are using 100l instead of 1l for the calculations) but, on this one there is no mention of the 5.8pH being the
'Optimal' value. Have they realised they may be in error?
View attachment 421961
Hope this helps?
MikeyB420.