Thanks for your response.....my chlorinator has "minimum" and "maximum" printed on it. self explanatory, right? not!!! the dial has three "prongs" on it. which one indicates the marker for setting the dial? i assume the middle one? once i determine which one it is, i'm putting red paint on it!!!! My goal is to learn half as much as most people on this forum know! LOL! Thank u for your help.