Duraleigh,
I'm not sure that safe sanitization levels belong in the China Shop forum.
I do agree with you that keeping it simple is good.
Adding two numbers and subtracting one is hardly major programming, even for Good Ole'Boys.
It might help by reinforcing Ben's calculator with a simple scientific index keeping those persons healthy who are out of range especially the high CYA, low Cl and high pH persons who own saltwater pools of which there are many here in Hawaii.
This persons are often suspicious of anything but pure science, I live next to one such person. But then again you may be right, even that might not work with them as Voltaire said, "A fool will not listen and a wise person does not need to know." In the middle I have always believed that there are the uninformed like me that is why I visit this forum.
Aloha
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