I am trying to help my mom and dad with their pool in Illinois. It's a vinyl liner in-ground pool, L-shaped, between 30K and 40K gallons (I'm trying to get the exact size, sorry).

It's had some algae, which is now at the bottom of the deep end to be vacuumed. They have a Taylor k-2005 test kit (a few years old), so I was able to have them do some of the tests. They also have a new 4-way test so we were able to verify the chorine and Ph, since the taylor kit is a few years old.

FC: off the chart high, pinkish colored (even half diluted)
Ph: Off the chart low (yellow color)
TA: 20
CYA: >100

The vinyl liner and the white plastic parts all took on a yellow tint over the last few days. They tried to brush it, with no sucess.

My mom is headed out to get a new Taylor K-2006 test kit later today- can't wait for Ben's kit

Where should I have her start? I'll be visiting her in a week with my kids, so I'm really trying to get this thing figured out before we get there! Any help is really appreciated!