I am using Sodium dichloro-S-triazinetrione tablets to make sanitizing solutions (approximately 200 ppm available chlorine) and disinfecting solutions (approximately 800 ppm available chlorine). Per my understanding and from what I've have read, these solutions do not have a long shelf life and should be replaced within 72 hours.
I am using test strips to validate the strength after mixing and testing each solution daily prior to use. I am storing the solutions in opaque chemical resistant bottles, away from heat and sunlight.
If the readings are ideal for the intended use, is it necessary to discard the unused portion per the recommended guidelines?