Re: Nothing works against this mold
If it IS mold, then you have a moisture problem. You will always have mold until you mitigate the moisture. How you mitigate the moisture -- if you can -- depends on how your slab is installed, the grading around your house, etc. That's going to be hard to diagnose from here.
If it's efflorescence -- same problem.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.