Not sure if EBs have an overflow hole. I use the rain gutter system and I always have a hole drilled about 2 3/4" up from the bottom of one of my buckets. I feed from the top and bottom. When it rains here, there is water just squirting out of the that hole. In my mind, the rain is flushing salt (and nutrients) down into my reservoir and pouring out of my overflow hole. It seems to keep mine working fine. I have not seen any negative results even when I use the same mix 2-3 times in a row. I do drain my entire reservoir 2 times a year.
I use the MasterBlend formula from the top and bottom until I have a good set of tomatoes. Then I use it from bottom and start using TTF from the top. Hope something in here helps.
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