Actually, I was encouraging you to ask for a discount. The discount itself would presumably be sufficient to eliminate their margin on this deal, and would probably make it a net loss for them. As companies are in the business to make money, not lose it, your discount would encourage them to be more cautious in the future.
Since your pool will likely be just fine, although filtration will be slightly impaired, it would make more sense to ask for a discount then to force them to rip up all the work and redo (but it's nice to have that option just in case!).
Anyway your call in the end, good luck with it.
Thanks for the clarification mercurial! I agree with you, it makes sense to go for the discount on the work performed and it's nice to have the other option on the back burner. Thanks again, I appreciate the advice and encouragement!