I checked the old thread about this and it doesn't seem to answer the question:
Is it a good idea to add Epson Salt (magnesium sulphate) to a Spa?
I already have 2000 ppm Pool Salt in there for the SWG.
Maybe this will give enough of the muscle relaxing sensation on its own without the need for Epson Salts.
If I added Epson Salts, would it alter my Salt levels or other water balance, asides TDS..?
I suspect this added complexity isn't required in my situation, but it's something I've wondered about for a while now.
Especially as the Epson Salt package states it is for use in "Bath, Whirlpool and Spa".
I assume that, once added, the Epson Salts stay until the next water change. For better and worse..!
Regards - D