The extended period of water movement through the concrete to the surface brought chemicals to the surface where they combined with carbon dioxide from the air to produce calcium carbonate the white chemical you see in this photo.
Efflorescence polished sealed indoor concrete floor.
Efflorescence will not only cause problems with a stained and sealed concrete floor it can also delaminate tile and warp wood floors.
Concrete can be stained when salts and other materials will come off the concrete surface.
Efflorescence will be triggered by low temperatures humidity condensation and rain.
The best approach would be to strip the sealer from a small area and perform a moisture test either a calcium chloride moisture test or an electronic surface moisture test so you can get an idea of how.
When moisture and water vapor migrate to the surface of hardened concrete floors walls and colored concrete it carries with it calcium hydroxide.
Joe nasvik an example of extreme efflorescence.
The concrete was placed colored and stamped shortly before winter.
Efflorescence will not only cause problems with a stained concrete floor it can also delaminate tile and warp wood floors.
The best approach would be to strip all the sealer and wax off the concrete.
You can apply armor ar350 concrete sealer to both exterior and interior concrete surfaces and it can also be used on concrete bricks natural stone pavers and aggregates.
Concrete efflorescence is a very common problem on concrete especially decorative concrete.