But nothing that cant be fixed!
New pool owner, installed in November and took the cover off last weekend. I closed it pretty well, as the water was only a bit cloudy and a slight green tint. Got the FC up and cleared the pool, but the rain and snow over the winter lowered the CYA to under 30. The dot was visible even when the tube was filled to the top, but there was a bit of cloudiness in it.
I used PoolMath and entered the current level as 20 and the target as 80 due to the SWCG I will be using as soon as I get everything balanced. PoolMath said to add 5lb 3oz of CYA to get to 80, so I used the sock method to add 5 lbs, but I placed it in front of the return instead of inside the skimmer because of the size. I did this Friday morning. Tested tonight and the dot goes away at well over 100. Also added washing soda to bring the PH back up to 7.2. I know this has to come up more, but I'll deal with that tomorrow.
I now that I have to drain a bit and refill to bring that CYA level down, and I guess that's the project for me after work tomorrow morning....
At least I read Pool School over and over since last fall and I have the knowledge!