The walls in my 63 yr old full walk out basement are crumbling in spots.
Moist basement concrete wall repair crumbling.
If dry the moisture is originating elsewhere in the basement most likely from a basement shower easily remedied by installing a vent fan in the bathroom to direct steam outdoors.
Mist the wall with water and then apply a coat of thoroseal with a latex additive check on amazon.
First off brush off any loose material from the basement walls.
Wash the walls with an acidic solution check on amazon to neutralize the salt completely and allow to dry for a few hours.
Apply small amounts of water over a short period until it has absorbed water deep into the wall.
The walls have been painted and the wall is crumbing in several places behind the paint and salt like particles have formed.