this is what fatlad69 told me
The pure peat moss is hard to find. I did come across one seller on eBay who sells it with no additives http://bit.ly/10UdeeQ as he uses it for carnivorous plants. I don't use charcoal just peat moss tree fern, torn up sphagnum, oak leaves and orchid bark. The substrate drains well and the plants go mad. It's a mix Wolfenrook recommended, you can usually find him in the phib section.