Thanks Janet

I've found a good number of websites that also explained the role that chlorine, CYA and other chemicals play in pool water. It's really quite interesting...and really gives me an idea why it's so advantageous to treat your water as described at this forum. Treat and correct the water from the beginning...then maintain correct levels with chemicals that cause minimal changes to other areas in your pool water.

I've still much to learn...but I am learning

thanks,
dan