Search for the Kitty's Crumble threads, KC is organic coir as well. There are a few different coir products on the market but they're all essentially the same. I believe it's best to avoid any that are not 100% organic, I think some of the gardening ones have water saving additives, so if you do that search, you'll find all the relevant threads where a few different products are discussed & compared.
They may say its 100% organic but it may still have wetting agents in it it its normal use is for in the garden.... I would suggest either the Kitty's crumble (search for other threads) or the coir peat blocks that you can purchase from reptile suppliers