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TDS(total dissolved solids) vs hardness
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cai
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Posted Sun May 8, 2005, 7:09am
Subject: TDS(total dissolved solids) vs hardness
 

Greetings,

A TDS meter is easier to use and is cheaper then the hardness test strips. Does the reading on a TDS meter equate to water hardness?

Thanks,

Cliff Isackson
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jim_schulman
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jim_schulman
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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.

 
Jim Schulman
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denniskeating
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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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jim_schulman
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jim_schulman
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Posted Sun May 8, 2005, 7:54pm
Subject: Re: TDS(total dissolved solids) vs hardness
 

French degrees are one of the seemingly endless ways of measuring hardness. It is mg/L hardness divided by 10, i.e, 1 french degree is 10mg/L or 0.58 grains per US grains.

French degrees is quite a rare unit; German degrees (DKH or KH) is more common, it's roughly 1:1 with US grains per gallon.

 
Jim Schulman
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