How do I lower ph in runoff?

Ph in with molasses was 6.21and runoff is 8.42. Help!!!

welcome :sunglasses:
I am in the same boat at pH 7.4 and I am flushing daily with this advice I poached from a fellow member …ps…I use Canna Down but there is a shed load of products out there.

Easiest way to lower ph… adjust water to 5.8. keep watering to runoff and check ph. when runoff is within range (6.5) you are good. sometimes you will need to use 5 or 10 gallons of plain ph 5.8 water before you get what you want. in the future, check the ph of the water AFTER you add all the nutes you want