Don't be alarmed.......chlorine levels expected in a Naked Pool are between 0-0.5ppm.
Many default tests from pool shops only manage 'chlorine/salt/mineral' based systems which require high amounts of chlorine.
When chlorine readings are low they will report that you need to add chlorine or more salt to the pool and purchase Stabiliser (Cyanuric Acid). Stabiliser is NOT required in a Naked Pool please refer to the attached Naked Water Testing document.
It's a great idea to take this to the pool shop with you so they know what they are testing for and will save you plenty on chemicals you don't need!