Welcome to our forum.
I recommend Swirl Away, because it's easy to do and why not?
HHT,20 ppm at what CYA level? CYA of 18 ppm would be the same as adding Dichlor? However, as you know there is quite a bit of difference between adding Dichlor, and straight Bleach. Using Bleach is ~6 times more potent than using Dichlor. i.e. 15ppm FC Bleach = 100ppm FC Dichlor.
This is the NSPA guidelines for pools. They do not state at what CYA level, but since the guidelines call for you to have a 20-30 CYA, I am going to say thats what they are going by, and they are using sodium hypo 12% to raise the level.Guidelines for spas is the decontamination procedure I printed from the CDC in the other forum which is much of the same information you printed, basically raise to 100 ppm, keep going out and turning air/jets on for the next 24 hours and drain.
Swirlw away is compatible with all sanitizers, even states it on the bottle. I know leisure time jet clean is not compatible with Baqa, but swirl away is fine.
Because it is incompatible with biguanide systems like BaquaSpa and Soft Soak.Swirl Away is a great product, but you need to make sure who you recommend it to. Granted, I understand we are talking about chlorine based tubs in this section, so I'm not disagreeing that it doesn't hurt.I personally have switched over to using Spa Purge instead. Same end result, if not better IMO. It takes longer (24 hrs) and you have to have the tub up to temp before you add it, but I really like the stuff.I recommend to my customers that they use Purge once a year, same as I do at my own house. The results have been fantastic, and for someone like you, Nitro, that watches your chlorine consumption so closely, I'm sure you'd agree that it helps.