New pool-calcium buildup and green water

Upser1

New member
May 4, 2020
1
Texas
Hello,
I purchased a new house 2 years ago and it came with a above ground 18’ round metal side salt water pool.i replaced the liner the first year. I have never had it right the last 2 summers. Last year I covered it this winter and it helped keep leaves and trash out of it. I pulled the cover this year and it looked pretty clear. Last year I had some heavy calcium buildup and it is still present. I purchased the the tf100 test kit and going to replace the sand in the sand filter. Any advice to get the calcium buildup off the liner and any tips to keep it clear all summer?