You should be able to measure TDS yourself by just measuring out a
quantity of water and then boiling it dry and measure the stuff left
behind to get TDS. Depending on your water quality you may need to
ask a friendly chemist/drugstore person to measure the solids on a
decent balance for you.
-- Brett Lymn, Computer Systems Administrator, AWA Defence Industries
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"It's fifteen hundred miles to Ankh-Morpork" he said. "We've got three
hundred and sixty three elephants, fifty carts of forage, the monsoon's
about to break and we're wearing ... we're wearing ... sort of things,
like glass, only dark... dark glass things on our eyes..."
- Terry Pratchett "Moving Pictures".