Quote:
Originally Posted by WaterWitchin
LECA in bottom, until it just covers reservoir hole. Handful or two of rock wool, more LECA, handful or two of rock wool, more LECA, then a bit of a mix at top. Still doing about 75% LECA and 25% rock wool by volume.
In other words, using the rock wool in some layers just to keep the wicking going upward. Just gut instinct, no actual science involved. I leave that up to others. But hey, it's working! 
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I just potted up two identical paph divisions - one in a layered approach, the other blended. We'll see if there is a discernable difference.