My free chlorine was a little too low (running between 3-5) instead of 7 for this past week. Yesterday I noticed a couple small algae deposits which can't be brushed off. My combined chlorine has climbed from 0.2 to 0.4 today.
I brought my free chlorine back into the recommended range and combined chlorine is still below the SLAM threshold (it's been between 0 - 0.2 until now).
Does the visible presence of any algae mean you must SLAM immediately? Or can I maintain a FC of 7 and let the chlorine gradually do its work?
I also realized yesterday that I've been breaking another rule too. I've been adding acid and bleach too closely together. This is a big no no, I guess? If I have to adjust pH, I usually add a small amount of acid in front of each return (with the pump running). Then I wait for approximately 5 minutes before repeating the same process with the bleach. Why is this such a bad thing? I don't smell any gas forming when I do it this way and I figured that the acid had enough time to dilute before adding the bleach. Am I wrong?