Just bought this house. The house has a "whole house" filter (looks like it's just for sediment, mounts right on the main plumbing line, has a replacement cartridge). All the water (hot and cold) smells of eggs. My water tests came back high in Iron and Manganese.
I have no idea how old the filter is on this system. Is it worth replacing, or should I get a water softener instead? (One of the bathrooms had some pretty good iron stains in the tub and sink).
The egg smell is hydrogen sulfide. Given that you also have iron and Manganese I recommend chlorine injection followed by a retention tank to give contact time followed by a backwashing Centaur Carbon filter to remove excess chlorine. If you also have high hardness this would be followed by a softener if you want soft water. If you follow this recommendation I also recommend you remove the "whole house" filter because they tend to clog and cause problems with backwashing filters and with a retention tank sediment will precipitate out and you can flush it away periodically with the precipitated iron, manganese, and hydrogen sulfide.
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