The walls have been painted and the wall is crumbing in several places behind the paint and salt like particles have formed.
Moist basement concrete wall repair crumbling.
Now you should apply water to the wall where you will be applying the mortar.
First off brush off any loose material from the basement walls.
Apply small amounts of water over a short period until it has absorbed water deep into the wall.
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The wall needs to be moist so that the old concrete won t leach moisture out of the mortar that you apply and cause the repair to fail.
Wash the walls with an acidic solution check on amazon to neutralize the salt completely and allow to dry for a few hours.