I have some GAC and it's currently in the filter. Undetectable S odor to me but Robin's gas chromatograph nasal receptors seems to easily smell it. I've found catalytic GAC in reasonable quantities also. The filter I wiped out had a combination of KDF 85 and catalytic carbon but it's not cheap! So I'm hoping to find a lower cost approach. She's tolerating for the time being since it's way better than the 2.5 ppm but I don't know how long this reprieve will last... If you ever meet her please don't let her know I'm delaying this because I'm trying to cheap out!
Thanks, the water has been all full of surprises and I've learned a LOT!Oh hey, I thought I read to the bottom of your story, but missed the bit about the well water. Sorry to hear about your current frustrations!
perhaps that explains the choice of her given name 
Ph from the well is 8-8.2 but quickly drops to ~7.3 after aeration.I think Robin may have been the proverbial “canary in the coal mine” in a previous life
What is the pH of the well water ?
We have two wells both in same formation. I'm using the one dedicated to irrigation so I can spray for max aeration no problem. We've been just waiting for tile thin set to cure... 14 days. Tile guy want to plaster earlier but no way! His finishing crew did tremendous job and I want it to stay that way for many years. I pulled the product technical sheets that clearly say full 14 days for submerged tiles in pools. Photo's of current status below. Pavers are almost complete just waiting to get the engineering for the enclosure footers approved so we can inspect and fill with concrete. Then we can lay all the outer tiles. Enclosure base plate will fasten through the marble pavers, it's currently in line at the fabrication facility. Won't show up for about 6 weeks but Robin can get a lot of spa time for her back while we wait. We'll just have Gracie stand guard for alligators!
Great question Matt and I've had that a lot. We'll seal and glue a 2" PVC pipe at each end of the gutters that will flow directly into the top of the basin. We've gone back and forth with different experts and contractors about the finish in the basin. Plan right now is to use water proofing material that is dyed black. There are 3 colors available and this matches well with the black grout. I've had several suggest we should plaster it but I don't think this is a good idea since it will often completely dry out and the kind of plaster I'm using shouldn't dry out. I could also add black tiles similar to the ones on the wall but that's a lot of expense that nobody sees. Once we get the enclosure in it will be hard to see that even from the lake side of the pool. Part of the reason for the PVC drop is that I need a valve at each end. This is to put the pool in "infinity only" mode where the valves close and pump goes to high speed. With the valves closed the gutters will fill up and pool water will rise about 3/8" to force all the water over the infinity edge. My wife really wants to see/hear max infinity wall flow at times. No idea if this will be needed or used extensively but was easy to implement. the outer 6" beam tile is slanted up to accommodate the pool level increase to make sure water doesn't go all over the deck for "infinity mode"