I took off the mesh loop loc cover off and water mostly gone except for the last 3 ft or so in the deep end. Up here in New England has plenty of snow on it this winter. My fault for not checking under the cover until now during the winter or early spring. Where'd the water go? No issues with leaks before. Shallow end seems like its stained too. Its 36 x 18 rectangle with fiberglass walls and either plaster, or cement floor and stairs. I'm hoping for the best, I don't have the budget for repair of any significance. First question is:
Should I fill it back up and see what happens?
Can I try to power wash the shallow end before I fill it? If yes, can I pour shock on it while doing so?
Will that damage the cement or plaster? (I suppose I want to use a wide spray angle...)