I've heard you lined the pool and are pumping in fresh spring water,is this true?

I dont believe the lake is lined, but it IS spring fed.

It is not lined but I believe they pump and filter the water.

No Liner, But its Pretty Clean for being a spring Fed, Has Sand at the Shallow end.

Sand everywhere except the far deep end where it’s shallow (where you’d get in or out). Spring Fed is true. Not sure what you mean by a liner....the bottom is cement (or whatever, it looks like the bottom of a public pool), but entirely covered with new sand. They drained it and had new sand brought in.