I solved the problem with this: https://www.amazon.com/Injection-manganese-Removal-Oxidizing...
... works really well and requires little/no maintenance for the first few years. Before that I had a chlorine injection system and it was a nightmare (maintenance-wise).
Very cool solution. I know many people that spent an extra $15k to drill 200+ft deep wells into the aquifer just to avoid the sulphur smell in the water from shallow wells. This would be a very cost effective workaround.
