Thanks guys, I too will probably be using coco potting mixes continiously myself, like you guys I have been mixing other stuff like pumic stones as well, I also have been putting a thin layer of sphagnum whenever I have some to spare. I have stopped using perlite mainly because I hate it when they float
Then again when they float it means I am overwatering!
So the Calcium Nitrate and Magnesium sulfate is both in "epsom salts"? I thought it was just Magnesium sulfate that is epsom salts, if so then no problem. Then again I am not too keen on actually purposefully putting any kind of salts or chemicals with my cocopeat/cocochips anyway! As I said we dont fertilize (at least I don't) our medium anyway.
I too don't believe much about the horror stories about excess salts in coco mix, I of course cant say that they don't happen, they might, but I have my own source, locally and so far no problem, plus I do just soak.
Thanks for the info about Tannic acid, I put dried leaves on my Betta tank for Tannic acid, I did this too in the water I use to water my plants till the monsoon rains came and I had lots of rain water. When the try season come, I might just go back to that, or maybe hope that my plants will get used to aged tap water already.
I don't think that all neps are sensitive to salts anyway, but I agree some probably will do well with acidic water and medium.
TTFN
Arvin