I have been using these filters for about a year. I have high iron levels in my water, it's not dangerous to drink, but the water heater will rust and leave rust spots where the water sits and dries out, like in a shower. This filter traps iron and lasts about 2-3 months. Lately I've been changing it every month because the water company is replacing the main line in town so the iron is flushed into the system.
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