Aylad ..you were in this thread..seems like it's just one big circle and stuff gets dropped and added to support whichever point of view. http://www.poolforum.com/pf2/showthr...yl-Pool-Liners

Anyhow:

+ OK pH range is 5 - 9
+ The idea of adding calcium carbonate scared him, because he said high pH is more damaging than low pH.
+ There are definitely variations in liner material quality, and there is imported knock-off material. But he thought the patterns (see website) are likely to indicate source fairly well.

Richard, you might want to talk to 'Flee-ler'.

Ben
Furthermore there seems to be some other theory's ... http://www.cgtpoolliners.com/cgt-tec...ulletin-10.htm

Research by both chemical suppliers and vinyl manufacturers have confirmed that wrinkles in swimming pool liners develop because of the growth of the liner's dimensions due to an excess of absorbed water. Technical articles published in the past have stressed the adverse affect of low pH as the main cause of liner growth. However, recent experiments have shown that high levels of sanitizers, whether bromine or chlorine are the primary cause behind excessive water absorption. If the sanitizer level is allowed to remain high, double triple or even four or five times the normal amount of water can be absorbed. Therefore, controlling sanitzer levels is the number one priority when maintaining proper water chemistry, which is essential, if wrinkling problems are to be avoided.

pH and cyanuric acid stabilizer levels are important secondary factors because they control the activity of the sanitizer.
I really care more about what is right then who is right ... balanced informed decisions are for each pool owner to make. Ruining a guys vacation because he's scared to death he might get a wrinkle in his pool liner doesn't seem too balanced to me.