Hi, Tim,

I have used bleach the past couple of years and loved the results, though the wife noticed around the permieter of the liner it appears the liner was bleached.
That word "perimeter" got me thinking a little. Is the fading above or below the waterline? If it's at or above the water, I would suspect you've got UV degradation (fading from the Sun) rather than bleach.

I've never seen a bleach faded liner, so I'm pretty much guessing but it seems bleach would fade at least as much underwater. If it's exactly at the waterline, perhaps that could be a combination of the two factors. It also seems that bleach damage would be spotty or blotched (from the temporary high concentration) and not very uniform in appearance

Lastly, I would say that dark blue is somewhat problematic for fading. Typically, darker colors are the most susceptible to color change over time.

I have never added bleach any other way then directly into the skimmer.