Rockwool runoff lower than input

Cactuspot

New Member
I am trying to get some insight from people experienced with rockwool. I run a drain to waste system and the runoff has been a higher ppm and a lower pH. From my understanding this is from underfeeding because salts build up in the medium and become acidic.

I'm currently feeding 6 times a day and am in week 4 of flower. My shot sizes are 3-4% of the rockwool volume which is 160ml per. I have a 4" on top of a 6" cube with drip irrigation. Any help and advice would be greatly appreciated.
 
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