Hi everyone! I joined you a couple weeks ago and haven't posted yet. I'm completely overwhelmed trying to learn all there is to learn about my pool. We noticed today on the tile grout that there is something brownish (see photo).
We have always had some buildup that I am working on removing a little at a time, but we haven't noticed this brown until today. My husband thinks it's a chemical issue or dirty water. I think it might be from our Crepe Myrtle trees. You see, whoever built this 14 years ago put 5 Crepe Myrtle trees surrounding my pool. Can you say pain in the butt? We are CONSTANTLY cleaning the blossoms out of the pool and baskets. Needless to say, they won't be there a whole lot longer, but their shade sure is nice.
Anyway, we had a rainstorm yesterday and the entire deep half of the pool was covered in Crepe Myrtle blossoms that I skimmed out. I did get the Taylor test kit and did my first test on my own yesterday. Here were my numbers:
Free Chlorine: 2.2
Combined Chlorine: 0.4
Calcium Hardness: 600
CYA: approximately 100 - 120 (different numbers from different testers)
I had been bringing water samples to the local pool store to have them test before trying on my own, so if you are interested to see if any numbers are going up/down/whatever, I can provide earlier numbers. I shocked the pool last night as we are having company over this evening to swim, and, after that storm I wanted to shock it.
My question is - does anyone have any idea what these brown markings on the tile could be? THANK YOU in advance for any help!