I'm having a problem controling metals in my water. The first time it happened I used a sock/vitamin c treatment on the steps and it worked (I've done this just about every year. This year though the stains started coming back about a week later and my water started getting cloudy with a yellow tint. So I took 2lbs of ascorbic acid and spread it around the parameter and by the next day the water was clear. Now I added a bottle of Algaecide and I added quart of PB Metal-Plus X out (memphis Pool's version of a sequestering agent), and the water looked perfect, but low and behold a week later the stains came. I did the routine again, and once again clear water that turned cloudy/yellownish and all plastic/fiberglass turned brown (steps, drain, outlets, baseket, etc). Is there a way to permanetly remove the metals from the water or is this going to be a year long task, that is getting very expensive to control.

Water readings for all of these occurances

FC 0 - 8 (0 when adding the ascorbic acid)
CC 0
PH 7.2
TA 80
CYA 100