i haven't done a sludge test, run-off test for over a year. i'll do some measurements over the next week or so - all my plants are in this Canna Terra Professional mix - and it'll give you, hopefully, something else to work with.
are we safe to assume we have the same product? put that aside...
i noticed my tap water varies in its pH range, anywhere from 5.8 to 8.0 - lately it's been on that lower side. I let the water sit for at least 24 hours to dechlorinate, typically, i add some Cannazym and
Cal-Mag, then measure its pH. The pH of this water solution is between 5.8 and 6.2 thereabouts, so i don't even bother adjusting its pH to any particular level.
that's gonna be the other variable factor between our experiences of using this Canna Terra Professional - our water source and its quality (pH level, etc).
sorry, got lost in the thread, but what are the levels you're encountering - what do your feed/water at, what's the sludge/run-off tests results?
I try not to fuss too much about my grow, no point tinkering something when the issue might be another matter. also, i try to make small adjustments in one area to see how it affects the growth, to see if it might be the area of issue.....
I use Canna Terra Professional because previous to that, i encountered difficulties growing in other commercial soil mixes.
oh, why don't i do all this soon when i buy the next bag, as i need to repot?