I am still trying to uderstand where the heavy metals came from. It didn't happen own its own.
If I wanted to sell salt and other supplements that are not pure I would recommend a water change, however the numbers are what the are and only removing toxins' and adding what has been uptake is needed. You can spend money and go round and round. Prove me I am wrong and do some assay for support. I will be looking forward to the data.
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If a tank is 150 gal and there is 20 percent water change what do you expect the outcome of the titration is in tds and components that you believe will be reduced? I just want the number so everybody knows. My determination isnt much.