Swimming Pool

I've had a swimming pool in my backyard since 2012. It's not very big (7x4 m.). Even so, it's hard for me to keep the water clean. Every day I turn on the filters for two hours, and at night I pour the chemicals into the water. It's a lot of work, but it was really satisfying the other day when my cousins and I spent all day swimming and playing water polo and volleyball in clean and clear water. The other day I was concerned because I poured copper sulfate, which I had read was anti-algae (green thing that makes the water.. green). It was supposed to make the water clear, but instead the water started to look cloudy, as if instead of pouring that I had poured flour. I was scared and started to search for information about it. I read that at a specific PH (8,0) if the water contains chlorine and you pour Copper sulfate to the mix, it would transform into Copper chloride, which is corrosive and bad to even breathe. Also, the next day my little cousins were coming to visit. I imagine that if they swam in that water, they would melt or something like that. One of the internet solutions was to empty the pool, but that wasn't an option as 30,000 lt of water doesn't go in a night and I would still have to refill it. In the end, nothing happened. The water was a little cloudy but not acidic or anything like that. For now on, I am just gonna use appropriate chemicals and not play Heisenberg