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I am still quite new to all of this water chemistry stuff, so there are a few things that I don't have a full grasp on. One of them being Total Dissolved Solids (TDS). Therefore, I have a few questions: Â 1. What is Total Dissolved Solids? Â 2. What contributes to TDS? Â 3. How do you measure for TDS? Â 4. What is the high limit where I should consider changing the water? Â 5. If the TDS is below this limit, does the water truly need changing, even if it is beyond the recommended duration since the last fill...say, a year has passed?Thanks!!!