Just finished replacing a liner in a 24' round AGP. Along with the usual wall rust, etc.
The old liner came with the house, it was only three years old. I knew it would be trouble, given that it was installed upside down (seam showing) but what was really bizarre was the condition of the bottom - the sides were perfectly fine, but the bottom was paper thin and brittle.
Is there a straightforward reason for this occurring? The water table is very high here, and I suspect the liner is reggularly wet underneath, but I would not have suspected that the liner would have been that brittle. I had applied a half dozen patches before I saw that the bottom would tear by simply walking on it.
Water chemistry is pretty nominal - I use chlorine tabs in the skimmer and only shock when free chlorine drps to near zero. I'm aware that my PH is usually a bit low, but never off the scale. I do add algaecide approx. monthly.
Any feedback would be appreciated. I installed a 30 mil liner - it was a big job and I don't really want to repeat it anytime soon!