Specialty Gardening: Container Soils and Water Movement in Containers (long post), 1 by stressbaby

stressbaby wrote:
Patti, coconut husk chips often contain a considerable amount of salt...not surprising given the distribution of the coconut! For this reason it is necessary to rinse the chips prior to use. I soak and rinse the chips at least 3 times. On the final rinse I add Epsom salts, magnesium sulfate. The magnesium serves to displace other undesirable positively charged ions, a process called "cation exchange." Without this step, magnesium deficiency can occur, I have experienced this with some citrus. Some people also add calcium nitrate, but this compound is not as readily available and I have had no difficulty using the Epsom salts alone.

I am not aware of anything that would suggest that CHC, once rinsed properly, contributes to more salt buildup than any other growing medium. I hope that answers your question. This is a Jaboticaba growing quite happily in CHC.