ticketblender said:
I sure wish I had seen this before I bought a whole case of the frog cartridges! Actually, the chlorine is the one thing that's always right in my pool, so in that regard I guess it's doing it's job. I've decided to take a pool sample over to the pool and spa store to see what readings they get, then after not buying the chemicals that they recommend, I will come home and use the calculator on this site to bring up my other stuff. Or since there's only a month at best left in my pool season, I may just use the PH Plus that they're sure to recommend and whatever else and start on the BBB next year. As a complete pool novice it's hard to decide who to listen to sometimes.I know that Baquacil use will void the warranty on the cartridge filter, but what about bleach? I'll have to look into it some more.
A whole case? Sell them on Craigslist or ebay.
Your chlorine is "always right" - if you mean their recommendation of .5-1 that isn't right at all.

I hope that's not what you mean.
When I kept my levels as they recommended I ended up with low PH (which contributed to the demise of my heater IMHO) and I ended up with organic staining at the bottom of my pool for three years. Further, I have permanent copper staining on my pool from using the mineral cartridges.
In the bacpacs is trichlor. Trichlor is acidic and will lower your PH and TA. You can use Baking Soda to raise TA and Borax to raise PH - you can do that now to save money this season. When using trichlor - you want your TA to be about 120 to help stabilize your PH which will drop rapidly using the trichlor.
The mineral cartridges turn blond hair green. Just be advised of that.
There are two elements with the Frog system and both are uber-expensive. The mineral cartridge which I have seen locally for $99 (every 6-months), and then in the middle of that you insert the bacpac, which I have seen run locally now at $17.99 (lasts 1-2 weeks when they don't malfunction).
You can treat your pool with regular products for a fraction of the cost.
When I had the frog, I used to spend hundreds of dollars each summer on pool store products, trying to maintain my water balance. They recommend shocking every 2 weeks, weekly in the heat of the summer. The granular shock products are expensive too, but that's what they suggested I use.
I now spend less than $75 the entire season (April-October).