@ Carl, the real problem with ever testing liners is that it is apparently impossible to take that info to the consumer.

The product engineer I spoke to yesterday told me that there are substantial differences in the durability of one liner compared to another, but that he knew of no way a consumer could tell which was which. He even told me that sometimes liner makers use sheet from one mfg for the liner body, and from another mfg for the 'tile line'.

So, unless you had an exhaustive set of liners, and tested all of them, you couldn't determine which rules applied to all liners, and which were specific to a subset of them. Worse, even if you did determine that data, consumers couldn't use it, because they usually would not able able to determine which grade and source of vinyl sheet was used in THEIR liner.

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@ Chem_Geek,

you can read them for yourself (and probably have) but the water guides looked like boilerplate pulled from chem mfg releases, rather than anything from internal liner testing. One page even referenced a Biolab source.

Regarding pH, the engineer was pretty insistent that anything between 5 and 9 was fine.


Ben