Hi I am on well water with a water softener and I am concerned about the health of my fish. It uses sodium chloride to soften the water. I know that it has a bypass, but I am concerned about any heavy metals that could come from using it. I am not sure if Prime would be able to take care of it. Normally, the water goes through the softener and then through a carbon filter to remove the heavy metals. Could I replace the carbon filter with an RO unit to have for the whole house? I am just not sure how to go about this.