Update using Qualisorb 628 for a week old now in my seed starting has had no issues. All veggie/herb seeds sprouted fine and continue to grow nicely. Mixed 2/3 Qualisorb 628 with 1/3 Promix BX as my starting mix. If there was a serious pH issue with Qualisorb 628 then there should have been problems but no issues so far.
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