Film on pool tiles - low TA?

[texag99]

I just noticed a light white film on the top of my pool tiles (just above water line) and tested my water and found TA was around 50. Would this be the result of my low TA and what do I need to add to raise it?

Thanks,

PH: 7.7
FC: 6
CC: 0
CH: 240
TA: 50
CYA: 45

 

[duraleigh]

TA would have nothing to do with it.

Do you have an SWG?

 

[texag99]

No swg

 

[duraleigh]

It's pretty common to have things precipitate out of your water onto the tile. Might be calcium but that's a guess. If you test it with about a 4:1 dilution of muriatic acid, it will foam a little and come off pretty easily if it's calcium. What attemps have you made to clean it so far?

 

[texag99]

Nothing yet as I just noticed it yesterday. I live in Austin and we have had 15ish in of rain over the last 12 days...would this have anything to do with it? Should I raise my TA as 50 seems low?