# Thread: how much chloride in water

1. If my raw water TDS is 200 and by RO plant the treated water TDS down upto 5 ppm.

Can any one knows how much chloride in my treted water if TDS between 5-10 ppm.

Is low TDS of water means low chloride in water ?

plz help me

2.

3. Originally Posted by arichem
If my raw water TDS is 200 and by RO plant the treated water TDS down upto 5 ppm.

Can any one knows how much chloride in my treted water if TDS between 5-10 ppm.

Is low TDS of water means low chloride in water ?

plz help me
We used to argue this all the time. But parts per million are based on weight as far as I can tell. Not volume of the substance in solutions or gases contained in the solution.

So your water is at worst 10/1,000,000th's of a gallon chlorine by weight, from what I could tell from all the nonsense.

If the gallon weighs in at 8.33 pounds. You have 0.0000833 pounds of chlorine in your water. That is still a good deal of chlorine, 0.0377 grams of Chlorine. Fortunately your stomach is chocked full of it. Your skin might get a little dry.

Sincerely,

William McCormick

4. LOL.

TDS stands for Total Dissolved Solids these will be a mixture of various cation and anion salts found in water. You evaporate a sample of H20 and weigh the solid dry residue.
there will be chlorides of metals mixed in as well as suphates , carbonates, phosphates etc.
the total Chlorine content is another story and analysis. TDS gives you an analyis of all the solid crud dissolved. google "total dissloved solids in water" for the long version.

6. The chlorine will make up anywhere from 20% to 60-70% of the TDS mass. Depends on the cations present.

7. Originally Posted by drowsy turtle
The chlorine will make up anywhere from 20% to 60-70% of the TDS mass. Depends on the cations present.

Years ago when we talked about parts per million of chlorine. It meant by weight parts per million.

What does it mean today?

Sincerely,

William McCormick

8. Originally Posted by William McCormick
Originally Posted by drowsy turtle
The chlorine will make up anywhere from 20% to 60-70% of the TDS mass. Depends on the cations present.

Years ago when we talked about parts per million of chlorine. It meant by weight parts per million.

What does it mean today?

Sincerely,

William McCormick
ppm is indeed parts per million. However, the total dissolved solids which is measured in ppm, is not all chlorine. This is because chlorine is dissolved as part of an ionic compound, rather than in its elemental form. So, the chlorine makes up some of the TDS but the rest is taken up by metals or other positive ions.

9. PPM by convention is by weight UNLESS stated otherwise. It can be by volume , moles, bushels or whatever but it must be specified as such. In this case it's by weight, Congratulations Wild Willy you got one right.

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