Thank you for your input.

Given the totality of the experience and evidence I do not see any reasonable way to deny it was caused by the pool. Especially considering other guests expressed varying degrees of skin irritation / burn after swimming also. In the end though, we aren't looking for a windfall but we do expect them to take the issue seriously and address their practice shortcomings.

If we pursued compensation it would be in small claims court and they wouldn't risk new litigants during the discovery phase, as we contacted other campers that could be affected.

But again, the main thing is they need to address their pool management and prevent injuring others, whether it be "chemical burn" or severe "skin irritation."