Hello Yunus. CDS will last a long time, but will lose CLO2 gas over time. I have tested CDS after 6 months and the CLO2 was down 1/3. After a year about 1/2. However, CDS is still effective after one year when stored in a cool, dark place.
About one year ago, I collected all the CDS test bottles I had in my fridge and poured them into a one gallon recycled HDPE jug that used to contain distilled water that I had purchased at the grocery store. That 1 gallon of CDS measured 2500ppm one year ago.
Then I gave the CDS to some friends who own a health food store. Two weeks ago they took out 8 fl oz of the remaining CDS, which by now is mostly gone & probably measures around 1000ppm, and mailed it to a fellow in another state who had pneumonia and was having a hard getting rid of it.
In three days his pneumonia was gone. The fungus on his hands he has had for the past 15 years was also gone after he had finished the 8 fl oz of CDS. He took about 1 fl oz per day.
Also, a lady with Lyme disease uses the same CDS to keep her stable, although she needs to do a proper protocol to finally get rid if it. CDS is great stuff, especially for external use.
CDS is pure CLO2 in distilled water, so there weren't any original ingredients to cause problems after one year other than loss of CLO2.