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Are you doing a form of hydro? If so you need to start from a fresh balance every week for the best quality nutrients, Over a week of additions and organic activities coupled with ion interactions what is in the reservoir now does not look like it did a week ago. If you had a lab, the proper equipment and knew how to use it. You could add back in to the res just what it needed to get the balance you seek and there are ways to kill pathogens that may get growing. Some of that growth may be beneficial but is it? On the sixth day of my res I do not top off the nutrients. If I want to add something organic I add it then. So on the seventh day the PPM drops to about 50% of the week before. Then I drain and clean my pumps and the reservoir and start the week with fresh in balance nutrients.So you're saying it's fine to add it back in as long as I change once a week? Didn't know I should even be changing once a week...