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Thank you, Dittohead. Your reasoning is sound. I do have Sani-System sanitizer and the phosphoric acid Res Care resin cleaner. My carbon filter is before the softener so the water that goes through the softener is void of chlorine. So I guess there is the potential for biological growth.

Thank you for your response Master Plumber Mark. Your explanation makes sense about moving the resin bed.

Thank you Reach4 for the reply. I will set DO to 28 days. As for the Fe and Mn numbers, I sent a water sample to a lab so those numbers came from their report. I'm not sure what happened there.

I am on city water with 7 gpg hardness measured with my Hach 5-b, 0.17 ppm iron, and 0.009 ppm manganese. We have a backwashing carbon filter in front of the softener. With the softener day override off, it takes my family around 3 weeks to go through capacity to initiate a regen on the...

Thanks Bannerman for the advice. I appreciate your help!

I have two 10" diameter, 1.5 cu ft tanks. The first is a backwashing carbon filter tank and the second is a 1.5 cu ft softener tank. My 1-year old Fleck 5810 filter valve failed after 1 year. Rather than doing a warranty swap, I'm having my service company swap out both valves (1.5 cu ft...