I have an old 40x20x9 salt-water concrete pool, probably made in the 80's or 90's. It requires a liner which we had to replace last year for $7500. It seems the chlorinator goes out every other year ($700) and the Hayward filter motor goes out every couple of years ($400). I'm working enough that I don't have time to maintain it (until I retire) so we pay ~$250/month for a pool maintenance crew. That includes all the chemicals, cleaning, and any simple maintenance that doesn't require parts.
My point; It's not cheap.
That said, I love the danged thing and I wouldn't get rid of it.
