Well I must have slacked off a little and I am paying for it now . I have had a clear pool all summer (and have never shocked other than opening day) and Monday night I pulled the solar cover off (it has been cold and wet lately) and the bottom of the pool had a light green film on it which was darker in areas where dirt seems to settle a little thicker. We had some rain over the weekend and I usually vacuum the pool manually every other day but the weather was lousy and we had a lot of rain.
My FC must have dipped <2ppm or else it was the rain because I did have to run the pump to waste to lower the water level for about 5 mins so it was really high (top of skimmer). I think I got lucky though because I did bump the chlorine level to 20ppm right away and vacuumed the pool. I could still see the bottom and everything came off the liner easily. The water was a light tinge of green probably because I stirred it up by vacuuming. This morning (Tuesday) the water was clear but it looked like the algae that were suspended last night while vacuuming settled to the bottom again where dirt usually settles. I vacuumed the pool again and brushed the sides and have been able to maintain shock level at 14-20ppm throughout the day in full sunlight.
My shock level with a CA of 30ppm is 13ppm so am keeping it a little over 13ppm because I have to work throughout the day which is why I am raising it 20ppm and letting it fall to about 15ppm by the time I get home.
Just to make sure I am doing this right should I just keep vacuuming up the fallout which is a smaller and smaller amount each time I vacuum or is there something else I need to do. I am also a little surprised that the Algae that is settling to the bottom of the pool is still a dark green and has not bleached out at 15-20ppm or is two days not enough time yet for this to happen? Also I am not showing any CC and have not since I found the Algae? I am glad I caught this when I did because like I said the water is still clear and looks good after I vacuum until the next morning there is some fallout.
I have had to leave my solar cover off and have gone from a nice 28C down to 22C in just two days of overnight lows around 9C. Lesson learned!
Current as of 09:00PM tonight
FC 14 (added 4 liters 12% to bring it up to 20ppm overnight)
CC 0 (this confuses me because there is Algae although not much)
22 Degrees Celsius