Im doing a DIY 18x36 this summer. Ive gotten a bid on doing the vermiculite and pool liner install but am questioning whether we can do this ourselves. My nephew owns a concrete company and they do great finish work, so I think they could trial the vermiculite in with no problem. My real question is does it have to be "vermiculite" or could it be a concrete truck mix without the gravel or is there anything else that can be used? I just have no clue where to get massive quantities of bags of vermiculite.