i didn’t either until i asked the ai for a deep research on it. now i concur. damage from pool chemicals. looks like the side with the pool filter is in the sun and dries faster than the side where the damage is greater. it stays cooler over there and the moisture leeches the chemicals into the block and they detereiorate the block. the ai said you can determine that using a thermal camera.
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I disagree. Based on the time the photo was taken (1:54pm) and the shadowing, the side of the wall with the most damage is facing west which is getting the most exposure from the hot afternoon sun and the highest level of UV rays.
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unless there is something blockiong the sun just past where it is now. if it dips below a treeline or another building soon after the picture is taken, it would explain it pretty well. we are well into guesses and possiblities now though. i’d like to see a picture at 5pm to see if there is any shadow there.
So your theory is a tree that shadows and cools the wall at 5pm? Considering the OP is in SoCal, barring any precipitation, I’d be willing to bet the wall is still warm long after sunset.
The cause is possibly due to a combination of the pool water chemistry (low pH, high Cyanuric Acid) and UV exposure.
i have no idea and am just speculating, as is everyone else. maybe the fact it’s warmer on that side draws the chemicals out faster instead of suppressing them like i was thinking. it also doesn’t matter where the block wall is located, if one side is in the sun the other is shaded. there is a temperature differential between the two sides, no matter how small. especially if a significant source of shade is near. i don’t know anything about the area from this one picture, but am speculating on possible situations.