From my experience, the warranty covers seam separation and darned little else. However, let's define seam separation, as the manufacturer views it, if the liner tears along the seam, but the 2 pieces of liner are still attached, it's NOT seam failure. They only count it if the 2 pieces of liner become unbonded
When I've had to replace liners for warrantied seam failure, I cut out the failed area and send it to the manufacturer. I have never been asked about water chemistry nor sanitizer, the seam failure is obvious and pool chemistry apparently plays little or no roll.
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