Hello Ipr,
If you are only looking at CLO2 content, then according to Tomas (our resident chemist), the amount of potential CLO2 found in 1 drop of MMS is 6.7mg which equates to 6700 ppm per drop of MMS. So you would have to take a little more than 2ml of CDS at 3000 ppm to equal 6.7mg. However, that's assuming full activation which probably never happens - but we really don't know for sure because every stomach is different - some people have lots of HCl in their stomachs and others have very little. So I would say you could probably take 2ml of CDS for every 1 drop of MMS and be pretty sure that you're getting at least the same amount of CLO2 per dose.
However, a dose of activated MMS is more than just CLO2. It contains some unactivated MMS, some of the activator and some other by products which all may play a part in healing process.
So you really can't compare a dose of activated MMS to a dose of CDS even if you knew the CLO2 content is the same. Sorry about that. I wish it were easier, I really do - but this is just the way that it is.
The product that we now have which is similar to CDS in that it causes less nausea, diarrhea, etc., for most people but also similar to MMS in that it still contains all the same ingredients as activated MMS, is CDH. You might want to give it a try since it is more similar to activated MMS than CDS. It's also extremely easy to make and costs way less than buying CDS from a vendor - which I know isn't cheap.
If you're interested in taking a look at CDH, here's a post I'd recommend that has sort of an intense dosing program aimed at really hitting a difficult disease hard:
g2cforum.org/index.php/list/cds-chlorine-dioxide-healing-solution/27230-a-new-way-of-using-mms-in-cdh-to-fight-all-diseases
May you be well,
Scott