Update,
White ring 8, Pool owner 0
So far I have tried the following to remove it:
4:1Acid
2:1Acid
100% Acid
Lime-away
CLR
3m Blue and Green scrub pads
Pumice stone
I tested everything on a extra piece of tile before trying on the pool. I also looked back at pictures I took of the pool and spa, I notice one photo of the Spa, the water level was down about 1" and I saw a faint ring on the spa tile (this was when I had the auto fill off). The date of the photo was 8/5, so this ring started happening 10 days after the water went into the pool. I checked my pool log and my numbers for the last 35 days have avg. as follows:
FC:3-6
PH:7.5
CH: 275
TA: 120-80( first 5 days 120, then dropped to 110 on 8/17, currently at 80)
CYA: 30-40
CSI: was 0.07 with a TA of 120, 0.03 @ TA of 110, and -0.16 @ TA of 80. None of these values is outside of the recommended range. So what the HECK??
The tile has not lost it's color, when wet there is no line, you cant feel the line with your fingernail. I can't possibly be the only person in world with this happening, well I guess I could but that not likely. I am open to any other suggestions. I have left a msg for my PB but I am not expecting much from him.
Sorry if the thread is frustrating, trust me its very frustrating for my wife and I, I just can't believe this is so hard to figure out, its not like I am trying to build a rocket here. I have placed a piece of tile on the step of my spa on top of a plastic cup so half is in the water. I am trying to see if it forms a ring on this piece then I can take it to somebody in the hope of fixing it. The other plan is to let it sit and see if it comes off on it's own, I can't imagine that is going to work since my water chemistry was not messed up and this should not occur in 10-30 days.
I really can't raise the water in the pool back to the line as the skimmer will not function, My guess is the set up guy who installed the auto-fill float adjusted it too high. I just never noticed until later. I will see if the Spa ring disappears as that water level is set with the spill over. Perhaps I am being negative but with my number as they are, I just can't see how bringing CSI from 0.07 to 0 to -0.3 is going to make this disappear, but I am praying it does. I hate reading threads that never come to conclusion so you never know the outcome, therefore, I will keep posting until I find a solution or give up. Any suggestions are welcome.
have a great weekend!