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Ok, the pool framing is probably 12 years old, we put a new liner in 3 years ago when we moved the pool from a friends house down the street to ours. We are the installers! We leveled the ground with sand but did not treat it at all, we are the original owners of the house and have been here...

I checked the CH again this morning and it is still 5.5, 0, 5.5.

No, we have absolutely no copper pipes or anything else, no ionizer, no algaecides ever, only salt for the swg. No heater on the pool. Ph has never been below 7.2.

It doesn't brush off. It is a stain. Tried the vitamin c yesterday, nothing happened, just added some vitamins to the water:) Did the chlorine tab and it worked but starting to see them again.

This is my first time posting but have been reading and using suggestions from here since we opened our pool 3 years ago. I use the TF-100 test kit since day one. This is our third year with our pool. We have a swg, 16x32 vinyl on ground pool, 13,400 gal approximately. Just recently we noticed...

I am having exact same issue with mine. Just purchased in May of 2012.