Keeping the Chlorine up and light yellow stains

[CanuckPool]

Looks like your pH is a little low which is interesting since most of the time SWG's usually creep your pH up. Sounds to me like your IC40 may not producing enough Chlorine... what setting do you have it set at? How did you test your CYA? With your SWG running, test your water right at your return.. it should be dark yellow/orange, if it is, something tells me that some sort of algae is consuming your chlorine quickly and you need to shock. You probably want to use liquid bleach to get your Chlorine up to 15ppm since you have a CYA of 30-50. Keep brushing the pool on a daily basis and test your water 2-3 times a day and keep the shock level up. Once your Chlorine level holds to 15ppm overnight you can let it lower itself to 3-5ppm. Vacumn any dead algae or debris and backwash/rinse. You hopefully should have a clear pool by then. you can use your IC40 to shock if you press the two buttons together, but most people like to save the wear and tear on their SWG's and use liquid bleach instead, its your choice.