So after 6 or so months of use, we're starting to get a little bit of swampy smell/taste to our water again. I need some help with suggestions on what I can do to determine the cause.
To recap, my system is a cartridge particulate filter, followed by a 1.5cf softener treating ~7grains hardness and ~1ppm iron, followed by 2cf centaur carbon treating for H2S taste and smell. Carbon is being backwashed weekly, 10 min BW and RR. DLFC is 7gpm if I remember right, 12" tank. Worked great until the last couple weeks, it's been a whiff here and there, not consistent, but both my wife and I have noticed it and seems to be getting worse.
Is it possible the carbon is already used up? Or is it more likely contaminated? I've had no obvious signs of bacterial troubles in my other equipment or fixtures.
Should I pull the head and dig around in the media with a stick? Can I sanitize it with bleach? Should I backwash more often, or more aggressively?