If you are talkin about a vinyl lined pool the answer is yes you can.
Gunite is covered with plaster. It is sprayed on concrete sorta. They mix it in the hoses and it is blown on. You can go to youtube and see them gunite a pool. I am only aware of plaster, vinyl or painted pool surfaces. The vinyl is just like thin rubber.
As long as the vinyl liner pool is inground, it can be converted. But you'll probably have to remove all of the vinyl pool elements until you have reduced the pool to a big hole in the ground and then start from there. All it takes is time and money!
An inground pool is typically lined with either gunite (concrete), fiberglass, or vinyl. Gunite and fiberglass are roughly the same cost, whereas vinyl is considerably cheaper. With the lower price comes less durability, as vinyl lining has to be replaced every 8-10 years or so, whereas the other two can last for decades. Vinyl is also much easier to puncture or otherwise damage. That said, many people still prefer vinyl inground pools due to the lower cost.
You can use the same hole in the ground for both a vinyl liner pool and a gunite pool. You should not need a new hole dug.
The average price for a 20' x 30' gunite pool would be $15,000 to $25,000.
I say gunite for the ability to create any shape pool you desire. Otherwise, you are stuck with the pre-fab design of the vinyl variety.
That can only be because of the source of your water.
In the Chicagoland area a small, basic inground pool will cost between $20,000 and $50,000. Some of the larger, deeper and more high-end inground pools can cost as much as $100,000. One of the most difficult aspects of planning for an inground pool is estimating the total cost. There are several variables that affect the overall cost of building and maintaining an inground pool, including the size of the pool and the material will comprise it.
== Is the water in?== Once the water's in, you're cooked.
Inground vinyl is better, their is less exposed part to the oxigene, therefore, last longer.
u can NOT convert one into another.... ud have to rip it out and start over... either gunite or fiberglass