Apply small amounts of water over a short period until it has absorbed water deep into the wall.
Moist basement concrete wall repair crumbling.
The walls have been painted and the wall is crumbing in several places behind the paint and salt like particles have formed.
Mist the wall with water and then apply a coat of thoroseal with a latex additive check on amazon.
Now you should apply water to the wall where you will be applying the mortar.
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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.