I'm a little suspicious of your drop kit results--it would be highly unusual to have a CC (combined chlorine--which is chlorine that is actively fighting something in the water) of 3+ unless you're in the middle of a Baquacil conversion or have some other major problems going on. FC + CC = TC. Did you maybe mean TC of 3+ ? Also--if you're using an OTO test, you can dilute your pool water with equal parts distilled water, test from that sample, and multiply your result by 2 to get a ballpark of what your chlorine actually is.

What is your CYA level?

Janet