This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Both metal and copper oxidize when exposed to oxygen and this is a natural process. Copper that is exposed to the outside environment is more likely to turn green and that is why copper vases and decorative pieces in gardens are often green.
Adding chlorine tablets (sanitizer) should alleviate this. If the pH remains high then add pH decreaser or pH down and follow the instruction on how to apply. If the pH is low and the chlorine is 3.0 ppm and the water remains green, then this could be an indication that your water has a high copper level. Have your water tested at the pool supply store.