Help evaluating a pool

hummmmmmmmmmm plaster problems inside the spa? It seems to be:

Efflorescence - Wikipedia

The big question is "how is the water able to get through the wall?" or is it from the "splash" of the overflow ?

it is not from the "splash", very weird. my friend just bought the house and the seller credit 5000$ for the "issue" (we still don't know what the issue is) but i guess we will have to find out ...
The pool inspection in the disclosures didn't even mentioned it...
 
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