Does this pool guy have some sort of business in the sale of chlorine tablets or chemicals? Perhaps he wants you to need to buy a lot more chemicals than we ever would suggest.
My salt pool costs no more than $150 per YEAR for all the testing reagents and chemicals we need. Because I have a salt water chlorine generator ("SWG" in TFP lingo) I can go on vacations to Europe yearly and still come home to a pristine clear, clean pool. I've never once had algae in 9 years of ownership. I'd say that speaks for itself, huh?
As for equipment, we bought the SWG once, and the cell lasted 8 years. We bought a generic replacement cell for about $300 and its working well so far. Pro-rate that expense over the years of service and it really isn't very expensive at all. How much is your convenience worth to you on top of that??
Tell us more about your pool now. Like, how is it chlorinated? How and Who does the testing? Any problems??
Maddie