This isn't a easy question to answer. It depends a lot on your process, the products you are making, and the amount of clean water you have going down the drain. Some examples of my monthly readings 8,200mg/L, 12,000mg/L, 7,600mg/L, Using the standard testing method 5210B. If you control what you If the farmer will take the added volume do a pre rinse before CIP and add it to the tank. I have some history working with the city and state public works, Water treatment facilitates, and the EPA. Send me an email or give me a call if you have some quick questions.