What's the proper Phenol Red solution to get for testing pH? I also have a PS233 kit and need some new reagents. My Phenol Red in my kit says R-0014 but on spspools-spas.com they only list R-0004A. Is that an acceptable substitute? What's the difference? Also the same question for the OTO reagent that is listed as R-0600 in my PS233 kit. What is the proper substitute for that since I don't find that on their website either?

Thanks,
Stacy