Warranty is void if:
Damage caused by unapproved sanitizers such as calcium hypochlorite, sodium hydroxide,
“tri-chlor” type chlorines or any sanitizing chemical that may remain undissolved on the spa
surface
Straight from the owners manual of Master Spas. Tablet chlorine is Tri-Chlor.
Other than that, glad it's working out for you! Don't destroy it though...