One thing that bothers me is how people run their pumps 4 to 8 hours a day and at night only. But I don't follow how chlorine loss during the day could survive without turn over? If you run only at night your water is stagnant all day and wouldn't the top few feet have fc0? And if you run it during the day what time do you add bleach? If you add it in the morning you run a chance you have fc0 over night and if you add it in the evening then you are kinda forced to run your pump over night?