That's spot on information from
@FastFreddi. Light, airy, fluffy, well draining medium that contains a network of air pockets for root development, watered very slowly to very slight run-off. I use FFOF/FFHF and perlite in my mix. It takes 7 shovelfuls to fill my 5 gal pts, 2.5 of which are perlite. Very little settling/compaction, with medium being held together by the root matrix. It may take ten minutes to water, so what.