Water mark on untreated cement floor

[Nikaah]

Hey,
so we have had a leak onto our basement floor through a RO unit and it has left quite the water mark. The floor is untreated concrete so it absorbs anything really. We are just wondering what the best way to get rid of this mark would be as we have tried scrubbing with CLR and that didn't work at all.

I uploaded some pictures of what it looks like and hopefully I can get some ideas on the cleanup process.

thanks

[judyfholmes]

The pictures are too small to judge the condition but I guess you should try Bissell 5200B Flip‑It. It can, hope so solve your problem. Do let know, if it doesn't work out for you.

[pushkins]

Sorry to say this but the stain is pretty much permanent. the stain comes from moisture soaking into the concrete taking with it salts and minerals, short of surface grinding back the concrete (you don't want to do that) there is little that will remove the stain. I always tell clients (tongue in cheek) concrete is guaranteed to do two things.....stain and crack.