Yeah, coir is something else! I think the issues with salts in coir have been mostly resolved by the industry. I usually buy it in bag form from my local hydroponics place. No need to deal with re-hydrating whole bricks of coir at once, and since I'm only using it for rooting, I don't use much.
Today at the hydro store they showed me their used-coir collection. Big pile of garbage bags. Apparently growers drop off their used coir, sometimes still in the fabric pots - and they offer it free for the taking for good customers. I doubt i'll chance using it with cuttings, but I'll certainly add it to my raised beds!