Coco Coir and Perlite caught my attention but then there is the salts that I ran from.
I have been using Happy Frog which hasn't given me a problem other than being high dollar.
I use a few hundred feet each year which runs into money.
The salts are from The GH Flora you are using, not the coco. You should give it a try...HUGE yields with coco!! BUT it is different from soil...It is considered hydroponic, and it needs it be watered daily. Multiple times daily is best once in flower, which is easily and inexpensively accomplished with an auto watering setup. Or if you are bored you can water by hand multiple times a day....but the yields are worth it.
Explosive growth in coco too....Probably twice as fast as soil in veg.
Yep, salt build ups will be a concern with anything using salt based fertilizers.
I like the Happy Frog too....I use it as a seed starter sometimes. Lately just use coco. Good coco....Canna coco.