A4
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I have seen it but don't know anyone that is using it. I actually mix coir in with promix when making my TLO and have real good results using it. I am not too sure the ratios in the HPCC but it should noted that some people that grow in straight coco have seen calcium issues. I am not a coco grower and haven't looked at it in quite some time but at one time they were "precharging" their coco with a cal/mag supplement to help out with that. That was using straight coco, and I am not sure if it would be needed with the HPCC or not. Just thought I would throw that out there in case you noticed some rust spotting on your leaves, it would probably be from calcium deficiency. I dropped an article link below that may help explain it a bit.@A4, sorry to sidetrack but since you mentioned the ProMixHP and it's lime level..
I had stopped at the local hydro shop and ordered the HP, trying something different than Hydroton/Coco Hempy's. They ordered it in and it showed up in the HP-CC variety. Have you any experience with the CC? Know of a thread on it's particulars? (search doesn't show much)
http://www.cannagardening.com/growing_on_coco_busting_the_myth