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My cost in RODI filters and resin comes to about $80 per year. In use of top off water and in rinsing equipment, I am using about 1000 gallons per year and about 800 gallons in salt water. I have a large system. So my cost at the LFS would be about $1 per gallon for salt water and $.5 per gallon for RODI. Salt costs me about $.25 per gallon. So to buy what I make would cost $1,300 per year. Figuring that I pay about $200 for salt and say $100 on my RODI system per year, my annual costs are $300. So I save about $1,000 per year. That does not even begin to count the time spent driving to the LFS, the gas and wear and tear on the car, or the fact that I know that I am producing 0 tds RODI and I know the salt mix.
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