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Its had to wash off all the dust or clay from the pebbles off... My ph or ppm isn't effected, but does the brown dust from the clay pebbles do anything to the plants when they get into the DWC rez?
from Hydroponics / Aeroponics https://www.rollitup.org/t/dwc-does-the-clay-pebble-dust-effect-my-rez-or-roots.1016428/