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Perlite hempy pH

2nd week of flower and runoff pH 6.7. Input is 5.7, using Jacks 321 @ 460ppm and Mad Farmer get down to lower pH. I had no pH swing greater than 0.5 until I added Power Si in late veg. Then pH rose to 7.2 with lockout of P. Flushed with water at pH 5.5 until runoff was the same. Plants growing normally with no leaf symptoms showing. Running 2 gallon buckets and watering 2 times a day to 50% runoff. Should I flush at 3 week mark again or am I shadow chasing runoff pH. Thanks


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