Hello and welcome to TFP! TDS - ignore their response .. and probably many others they give you. Stay away from the pool stores, they'll only give you bad advice. Test your own water with a TF-100 or Taylor K-2006C (link below). Spend some time reviewing the other links you see below in my signature and you'll be in much better shape.
By the way ... here's a good discussion on TDS: What is TDS?
TDS is a "scare tactic" sales model used by many pool stores. As many things both good and bad contribute to the TDS number it by itself is meaningless.
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