Fiberglass in ground

[Searcher]

I have a friend who recently bought a house with a fiberglass in ground pool.
The previous owners recommended that they empty about half of the water out of it
when closing it. Sounds strange to me, what do you think?
No light, all plumbing external. the ex owners have sealead all the original
underground plumbing off.

External as in the pipes are all running inside the pool now?

What State are you in re freezing episodes.

[virangos]

No idea why the plumbing was sealed off. Now they just have hoses running in and out of the pool to the filter.

In PA. we freeze.