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If you get a chance later, I'd be curious as to why. I'm a biochemist by trade, and have training in physical and inorganic chem as well, so I always like to understand the chemistry so that I can better control/manipulate it.

We added some Ca hardness from the pool store to a spa. After 2 weeks, it just sat in the pool completely undissolved. It also managed to get into every filter, jet, etc. The spa has been just emptied and refilled... is there something we are doing wrong in the addition of Ca hardness? Is...

The problem is that when you do a FAS/DPD Cl/Br test, you cannot tell if the pink is from bromine or chlorine, you can only tell that you have active sanitizer. Thus, if you shock with a half cup of bleach, and you then test for sanitizer, it will be positive whether or not you have a bromine...

Thanks to both of you. I did open the spa with a little packet of Brom-Start (it's 2 oz. of NaBr salt, solid). Basically, I put in new water, balanced total alk (~120) and then pH (~7.6), and then added the NaBr. Waited a few minutes and added a packet of the potassium monopersulfate shock...

Thanks for that Joyce, but I'm still not sure how I can tell if I have enough Bromine reserve in the pool to add an oxidizer to regenerate the sanitizing hypobromous acid, or if I need to replenish the Br first. Any idea how to figure this out? Thanks. Matt

I've had a Cl based pool with a SWG for a few years now and have had no trouble with that. I use a Taylor K-2006 for testing. I now have to figure out how to balance a spa. This spa specifically prohibits the use of Cl (although I assume that refers to hypochlorous acid and not Cl- ions). I...