is lava rock just as good, or do i just need hydrotron for this, u used hydrotron in my DWC grows but was going to switch to lava rock, how will lava rock fair in ebb n flow?
lavarocks will work fine in an ebb & flow system but i personally would stay with the hydrotron due to several reasons; lavarocks have irregular micropores that roots & bacteria love to fill,sterilization is never guaranteed unless your using them for 1 grow only then buy more. They also might contain traces of heavy metals which could cause ph swings & nute deficiencies. irregular rock shapes provide uneven airation & wetting in the rootzone,roots will be less able to penetrate evenly throughout the medium. Hydrotron stays moist longer & lacks the sharpness that tends to be harmful to soft tissues. my 2 cents mate, hope it helps