TA 100 (goes from green to clear, not red)
Geesh! I'm struggling this year.
Five days ago I had a family of teenage boys over to swim. I could tell by the time they left that the water was already cloudy. I immediately bumped up my FC to 25. Within hours the water went from cloudy too dark, dark green-ish red. That was on Wednesday. Thursday morning I got scared and moved the FC up to 60 based on the mustard shock level. I just didn't want to have any downtime. Friday morning the pool change to a green tint instead of a solid green. I could clearly see everything in the pool but it was like looking through green tinted glasses. The pool has maintained the FC of 60 with only a loss of five overnight which I just put back up. This morning, Monday, it is down to 45 and is a horrible shade of yellow orangey green. I do have a bright blue liner and I figured that was affecting how it looked so I took a glass jar of water out of the pool and the water appears to be perfectly clear. I knew my CYA is high and I did do about a 20% water change to get it to the 100 mark, I am trying to compensate for that in my slamming. I read another article on the forum and it got me to thinking, could this be metal and not Algae? Normally when I have algae and I slam it, it turns a cloudy shade of blue, all the dead algae falls to the bottom, I vacuum and the whole thing is over in about 48 hours. This is something very different. Can you help? I'm thinking of having the pool store test for metal? Also the PSI on my filter has been running about 5 higher than normal even after backwash, I am thinking I need to change my sand, it has been about three years. Could the sand be affecting the water color?
I'm posting before and after pics so you can get an idea of the color.