Can anyone provide me instructions on how to make lavender spa salt?

Peter N asked:


I've searched around a lot but there have always been different instructions on how to do this. Some say to add lavender oil and others say to add dried flowers. Some say to use epsom salt, some say to use dead sea salt. I've also heard that epsom salt can ruin the piping in a spa.

I would appreciate it if anyone could provide me with a guide and instructions on how to make lavender spa salt. I plan on making a huge quantity (hundreds of pounds, possibly a thousand).

Atlanta Day Spa