Making CDS The Safe, Easy Way!

I sometimes get those bubbles, too. Not sure why they form, but I doubt they cause any harm.

What recipe are you following?

i was following Kalcker's double infusion method.
that photo was taken sometime around 6 hours after activation if i recall correctly.

update: i did 2nd infusion (still with bubbles), after cooling it in the ref and taking out the activator/shotglass. bubbles still present but seemed much tinier already. next day i peeked at the cooled CDS, no more bubbles.

did the test using lamotte strips, diluting it 1ml to 9ml water, i arrived at somewhere 250ppm-500ppm range. can't make out the color. sure it wasn't 500ppm (since it was too dark), the strip color is somewhere 250-500ppm. seems good to go.

what i will try to do next is infuse it in 'mineral bottled water' that claims it is pH7. i will compare pH level vs this batch which was made with distilled water.. the reading is below 6.0pH (which my current pH strip can accomodate).. ordered a wider range strip to find out the exact pH level next time.

It is difficult to read CLO2 ppm with test strips when the color is between 250 and 500 ppm. I suggest you dilute your test sample so 3000 ppm would read at 50 on the color scale. That would be 59 ml water + 1 ml of CDS. Multiply the reading by 60 and you will have the ppm.

Glad to hear the bubbles are gone. Looking forward to knowing the pH when using mineral water. I believe the reason mineral water has a higher pH is due to the dissolved minerals. You will make a batch of CDS using mineral water or you will use mineral water for diluting a dose of CDS?

By the way, I developed the shot glass double infusion method of making CDS in 2015 and posted it on my website. Andreas apparently found my research paper and decided to make of video in 2019 showing my method. I appreciate him making a how-to video, but he forgot to give me credit for the method. That could be called plagiarism.

"I developed the shot glass double infusion method of making CDS in 2015"
!Sorry!

Yes, I am planning to use mineral water for making a CDS batch. Don't know if this is a good idea though? Since I can just add that 1ml:1000ml ratio using mineral water..
I think that dilution is enough to raise the pH from a 5 to near 'neutral'?

I am just intrigued when AK said in his book that CDS is 'neutral' pH.

If possible, it is usually a good idea to verify what you read in books, see in videos, etc.

I use triple filter water to make CDS and I think that is okay, distilled water may not be necessary. Checking with a TDS meter, I don't think there are any minerals in the filtered water as the meter reads zero. Will minerals affect CDS? Probably depends on the different minerals in the water.