The thing we have been trying to say is that the pool industry has blamed TDS for problems in pools that have nothing to do with TDS. I suspect part of that is from the chemical companies that manufacture trichlor because if the word got out that their stabilized chlorine caused the problems in pools it would hurt their sales so they use TDS instead. Bottom line, if you have old water your TDS will be higher than if you have new water. This in itself does not cause problems but if trichlor was used there will also be very high levels of cyanuric acid and that WILL cause problems. If they blame the cyanuric acid it would hurt their sales. The cure for high TDS and high CYA is the same, however...drain and refill!
Don't worry about TDS is all we are trying to say.