waytoxic

I have a two year old 24 foot round above ground pool. The liner above the water line has dark brown stains on the sides of the pool that the sun shines on. The south side is still blue. I have tried every known cleaner on the stain and nothing works. Has anyone else had a similar stain, and how did you clean it off?

Happens to all the light baskets. I added a small rock to mine, it works fine.

It sounds like the filter has a small hole in it, or a missing bolt. Your filter is passing diatamatious earth from the dirty side to the clean side. This has happened to my pool in the past. Take the filter apart by removing all the bolts around the top. Pull the filter up and set it on the ground. Hose the DE off and inspect the "fingers" for cuts, tears, holes. Make sure all the bolts that hold the filter to the "bumping plate" are still tight. If one fell out, that is where the DE is passing into the clean water side of the filter. Replace the missing parts, and put the filter back together. Recoat the filter with new DE and with luck your pool will remain clean.