CDS QUESTIONS - First timer with making CDS

I tried following the method outlined by Dr. Kalcker on his website but I couldn't get 3000 ppm only 1500 ppm. Any ideas what I am doing wrong?
dioxitube.com/w/49HQcH4TKwwHYPcYn15i9R

In a 500 ml jar, I placed a shot glass inside and filled the jar with water up to about 1 cm below the top of the shot glass. That works out to about 300 ml of purified water. Then I added 5 ml of sodium chlorite solution to the shot glass and 5 ml of activator (4% hydrochloric acid). I quickly sealed and placed the jar in a dark cupboard. After about 18 hours it looked like the color in the shot glass and surrounding water was similar. I measured the ppm with the test strips after diluting by factor of 10 and got about 150 ppm (1500 ppm for the actual undiluted solution) which was also what Dr. Kalcker said you should get.

Now to get the CDS solution up to 3000 ppm he says we should repeat the process with an empty shot glass in the existing CDS solution. I did so, and after about another 18 hours (I did a few hours longer just to be sure) I got what looked like similar color in shot glass and surrounding container but not really any brighter CDS solution than the first pass. So I extracted a portion of the CDS solution, diluted it by a factor of 10, and tested it with the test strips. To my surprise it was still about 150 ppm! Why didn't it increase in concentration to 300 ppm (10x diluted) after the second pass?

Just realized that I failed to mention that the 4% HCL and sodium chlorite solution used to make MMS were sitting in my fridge for about 2 years. Could it be an issue with degraded potency?

Dante, testing has shown that SCS begins to lose potency at about 18 months, so that could be the problem. But,  you did not see any increase in CLO2 ppm after the second infusion and you should have seen some increase. 

Consider increasing the dilution of your 1ml of CDS for testing with CLO2 test strips, from adding 9ml of water, which puts you at the high end of the color match scale, to adding 59ml of dilution water. If your CDS is 3000ppm then the color match would be 50ppm x 60 = 3000ppm. Note that 50ppm on the color chart is mid-scale and not jammed up against the high end of the colors where you can't measure the CLO2 accurately. 

Lastly, if you would be interested in making 3000ppm CDS in about 3 hours time, let me know. I call it 'Quick CDS' (QCDS) and it has been around for about 4 years. It replaces my old method that AK shows in his video. You can even use your existing bottles when making QCDS using the 'Dry Method'.