I recently bought a home with a 17,750 gallon salt water Gunnite pool. The pool was put in approximately 1.5 years ago. My water has been crystal clear without any problems. But in the last week or so I have started to see brown rust spots/buildup on the bottom of my pool. The pool is a lap pool with the middle being 5.5ft deep and sides 3 ft deep. The spots are not concentrated in one area. I do have a rock waterfall that I think could be the culprit. I would say some leafs fall but very few. (Only one tree within 100yards). I have read some other forums and have tried a chlorine tab, as well as vitamin c and have not seen any dramatic changes in coloration. Thanks so much for the help!
I could add pics if I knew how.... Lol