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Definately test for nitrate and nitrite, phosphate, silliacates, pH, and alkalinity. Alot of softener retailers do fairly comprehensive testing for free. RO or RO/DI water on the other hand is eaiser to work with. Its parameters stay more or less stable (same can't always be said for well water.) Also, you may decide to use the RO water for drinking and cooking anyway. If you get a RO/DI unit, the drinking water tank and faucet are teed in before the DI cartridge.
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You'd think a plumber would have a sump.
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