FoxGrowcommentedweek 68 days ago
So: day after I postet my question, The run off ph suddenly rose to 7,1. I couldn't help but wonder. So I checked the water analysis from my local supplier: I have super high Calcium and low Magnesium. This could explain that the soil (BioBizz Light Mix) can't buffer any more due to the 11:1 ratio of Cal/Mag. -- I use (cheap) citric acid to lower my ph which easily is neutralized by the calcium-kation in absence of enough Magnesium. So: I will add epsom salt to balance the CalMag ratio (water still has fitting EC level then). In addition I switched to phosphoric acid to lower my ph. This would make sense since my last grow also had these strange symptoms even thought I followed protocol. What do you think?
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