Taking over a small apartment block with swimming pool , both in disrepair. The swimming Pool pump and filter & much everything will have to be replaced, nothing is working at the moment, and much of it missing. They are (whats left) underground next to the pool, I have an area near the pool where I can set up a new system, or just replace the old system where it is. Salt water sand filter. I have had conflicting advice on this, some saying the underground is better others replace it all above ground. My knowledge on anything to do with swimming pools is a little less then Zero,
The pool is about 69K liters.
litters.