m0useanswered grow question 5 days ago I have used CANNA coco compressed brick and will keep using it. great stuff. Rinsed, Buffered and Aged.
Even the lower end quality ones just need a good rinse and some buffering "CaMg" but why waist your time with it when you can just get a better quality one. Before I knew about the high and low quality coco's I mixed a lot of lower quality stuff into my outdoor garden and it was fine. The rain helped wash out any left over salts but it was also mixed up with soil so not just coir. If your doing just pure coir aka coco, then get a better product that is buffered. CANNA or likewise. Don't forget the perlite as well.
Good Luck!