I’m going to agree with Fixbear and Ectofix.
Use the original, correct tablets. They were designed for use with this unit and if anything ever goes wrong, you can say “I used the right tablet”
I guarantee 10000% that if you called Rational and said, hey I’m having a problem with the sprayer, or the heat exchanger or heat element is cracked. They would ask, what chemical are you using to clean it?
You say anything other than their original, specified product, it’s your fault and any warranty you might have had would be void.
I’ve had many fights with manufactuers on these things and the slightest deviation can mean the end of free help.