jim_schulman Senior Member Joined: 19 Dec 2001 Posts: 3,772 Location: Chicago Expertise: I live coffee
Posted Sun May 8, 2005, 9:38am Subject: Re: TDS(total dissolved solids) vs hardness
It correlates, but doesn't equate. If the water is "standard natural," having picked up its hardness from limestones, water at 5 grains or 90 mg/L hardness will have 150 mg/L TDS. So a very rough, ballpark, conversion is 30 mg/L TDS per grain of hardness or 6 mg/L hardness per 10 mg/L TDS.
denniskeating Senior Member Joined: 29 May 2004 Posts: 21 Location: metro denver Expertise: I love coffee
Espresso: Brewtus 1 Grinder: M3;mini E Roaster: RK drum
Posted Sun May 8, 2005, 11:04am Subject: Re: TDS(total dissolved solids) vs hardness
Hello, The accompanying chart for my hose end/reservoir water softener shows 300 grams of salt dissolved water will treat "x" litres of water that has a hardness rating listed in french degrees. Are french degrees another way of representing hardness? Dennis
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