I only have the Aqua Swim test strips so I will need to purchase the test kit from Walmart today before I can send the readings. In the meantime, I've been extremely lean on adding chlorine because I don't know what I'm doing and I don't want to make it harder to get the iron/rust out, but I also don't want to deal with an algae problem. What should my chlorine level be at while I'm dealing with the iron problem? Should I stay away from shock? The pool was filled over a 3 day period - filled completely 6/18.