Well, now that my pool is 99% under control (through proper use of my TF Test Kit and a real shocking job)... I've gotten curious.
I went to my local Pinch-A-Penny (They sell Taylor reagents) and was curious to see how their testing battery would compare to the one I performed that morning. They were WAYYYY off on everything... especially on the salt concentration. Mine is correct (3rd party verified) and they come in 2000 ppm's lower. Always. I know enough now not to trust their testing lab.
But they did show high Calcium Hardness. My pool does have have high CH all the time... but I haven't had a chance to do a partial drain and fill.
The teenager behind the counter immediately grabbed a bottle of their Suncoast Brand Ultimate Metal Control and Salt Solution, claiming I needed it to prevent staining of my pool's surface. The kid couldn't tell me what chemicals were inside it and how it would affect my other chemistry.
Anybody know what it would do? Should I even bother with it?