file ppm of cds reads only 50

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23 Sep 2026 15:06 - 23 Sep 2026 15:07 #89100 by dragon88
ppm of cds reads only 50 was created by dragon88
I have been making CDS for few years now using kalcker's method (5ml acid abd 5ml SC, in 250ml distilled water, repeating twice for 48hrs, using 1:59 dilution for testing the ppm ).  these past couple of times the ppm of cds reads only 50ppm instead of 100.  what factors could cause this?  
Last edit: 23 Sep 2026 15:07 by dragon88.

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24 Sep 2026 00:05 #89101 by CLO2
Replied by CLO2 on topic ppm of cds reads only 50

I have been making CDS for few years now using kalcker's method (5ml acid abd 5ml SC, in 250ml distilled water, repeating twice for 48hrs, using 1:59 dilution for testing the ppm ).  these past couple of times the ppm of cds reads only 50ppm instead of 100.  what factors could cause this?  
Hi dragon88. 

I assume you are using LaMotte High Range CLO2 test strips. Your dilution of 1ml of CDS into 59ml of water is correct. So, 50ppm x 60 (1:60 dilution) would be 3000ppm CLO2 (CDS). Perfect. 

The dual infusion method of making CDS is only needed if you are using 4% HCL acid. If you use 50% citric acid only one infusion is needed, so your CDS is done in one day. But, the recipe changes. 250ml of CDS water and 12ml of 22.4% SCS + 12ml of 50% Citric Acid Solution (CAS). 

For the past six years I and another person have been developing the 3 hour Quick CDS methods and just the other day I was able to make 3100ppm CDS in 2 hours time by including a method developed by two people in Germany. 

Please read the attached PDF files. Note that one of the PDF files describes making 3000ppm CDS using the dual infusion method that I developed in 2015. The method was not developed by Andreas Kalcker. He found it on my website MMSinfo.org   

 

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26 Sep 2026 17:31 #89111 by stu77000
Replied by stu77000 on topic ppm of cds reads only 50


For the past six years I and another person have been developing the 3 hour Quick CDS methods and just the other day I was able to make 3100ppm CDS in 2 hours time by including a method developed by two people in Germany. 
 


Would be interested to hear more about this. I know how to make the 3 hour version which gives you about 3700ppm, which I dilute to 3000ppm.

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26 Sep 2026 23:20 - 27 Sep 2026 03:32 #89112 by CLO2
Replied by CLO2 on topic ppm of cds reads only 50


For the past six years I and another person have been developing the 3 hour Quick CDS methods and just the other day I was able to make 3100ppm CDS in 2 hours time by including a method developed by two people in Germany. 
 


Would be interested to hear more about this. I know how to make the 3 hour version which gives you about 3700ppm, which I dilute to 3000ppm.
Hi Stu. The info on making CDS faster than one to three days, to one hour, is in the attached PDF file. 

Here is a link to a video about this new method of making CDS. 
Last edit: 27 Sep 2026 03:32 by CLO2.
The following user(s) said Thank You: stu77000

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