We've been using MPS for a couple years as a weekly maintenance shock in the pools at our hotel, mainly due to the "swim in 15 minutes" claim. We have a 35,000 gallon chlorine pool outside and a 25,000 gallon bromine pool inside. Still, I was curious about the effects and possible interactions involved when using this product.
According to my CPO handbook (just got it this week and take the test in April, hence my discovery of this fantastic website!) MPS interferes with Combined Chlorine readings when using a DPD test. If CC is TC - FC, does MPS effect TC or FC since the CC isn't directly tested? Or does it slightly effect both? Does it effect bromine readings at all?
I also had another question about using it in bromine pools that I asked in another thread but it wasn't quite answered. If I use MPS weekly in my bromine pool and an "incident" occurs that requires a CalHypo dosing (which hasn't happened in these couple years, thankfully), is there any interaction between the two? I've read in a couple different places you should never use one in the pool if the other was ever used in it. Is this fact or fiction?
I'm going to be switching to CalHypo in the outdoor pool I think, but it seems to be easier in the indoor.
Thanks in advance, this site is a great resource.