Help! - Deposits!

[tcmdo]

The following pics are from our 36,000 gallon, freeform gunite pool, running a hayward SWG. there are only deposits under the waterfall from the spa.
Latest numbers (today)
pH 7.8
TA 100 (I have been aerating and adding acid to lower, usually running 80-90)
CH 330
FC 3.5
CC 0.5
CYA 75
I am increasing the swg chlorinator to bring up chlorine to 6, but noticed these deposits. Any ideas? Also, cleaning suggestions, not worried about stone, but do not want to destroy my tile!

Thanks

Todd

 

[J20832]

Looks like iron. Check this out http://www.troublefreepool.com/pool-school/metal stains

You could always take a sample to the poolstore to test for iron. Maybe take a sample of fill water as well, particularly if it is from a well.

It could be partially due to your pH being on the high side.

 

[257WbyMag]

If you are referring to the white deposits on your tile and stone, it looks like efflorescence. See link...likely-calcium-deposits-t4616.html?hilit=efflorescence