Chlorine is consumed by UV in sunlight and by oxidizing organics.
You can eliminate the sunlight variable by performing the OCLT. If you loose more than 1ppm, then there are organics consuming the FC.
Its the quickest test to do, and the most logical at this point.
You can eliminate the sunlight variable by performing the OCLT. If you loose more than 1ppm, then there are organics consuming the FC.
Its the quickest test to do, and the most logical at this point.