I mix in Hydroton or perilite and it works GREAT i even put pure perilite or hydroton then last inch of pots and use a window screen to cover the pot holes so it doesnt spill out.25% perilite or hydroton and 75% soil
Benefits it gives are great such as better oxygen for roots(aeration) and way better drainage .when clones are 1-3 sometimes 4 weeks old my soil dries up within a week,and after the plant is big especially in flower i got to water 2x sometimes 3x a week i start in party cups then 1 gal then to 5 gal buckets
them cheap soils dont have trichoderma in em either chek for mossy mold shit on the underside of the pots iv seen that pirrana by advanced nutients get rid of that but its dear, alot dearer then buying half decent soil/coco