Quote Originally Posted by not2high2fly View Post
Just put a new black liner in my 16x36 8' deep end inground.
For the record, there is not ANY chemical treatment process I would guarantee to leave a black liner untouched!

However Baquacil / Softswim / PHMB is *less* likely to fade a black liner than chlorine. PHMB works OK if you drain 1/3 of your pool volume annually. Doing that safely with a liner is a trick, however. You also need to replace your filter media (sand, cartridge) annually. DE filters work well if you NEVER allow the pool water to be filtered by bare filter membrane fabric that is unprotected by DE.

If you have any liner pieces left laying around, you might want to mix a cup of bleach into a gallon of water, and leave the liner bit in overnight. If it's unaffected, you are good to go.