This is a concrete pool. It’s called gunite because some builders use a “gun” to shoot the concrete up onto the pool walls when building the pool shell.
Perceived by public as a high-end pool. Highly customizable because most of the pool is built by hand. Lasts a long time and low maintenance.
Expensive to build. Must be re-plastered every 20 years. Susceptible to plaster scale and hydro-static lift.
Think of a really big bathtub. That’s a fiberglass pool.
It is possible to build a fiberglass pool very quickly. They come in lots of shapes, sizes and colors.
Are comparable in cost to Gunite Pools. Are not customizable (preformed at factory). Must be built by highly skilled and experienced crew to prevent catastrophic damage to pool shell down the road.
These pools use 14 Gauge galvanized steel, fiberglass, or concrete wall panels, a water permeable vermiculite pool bottom and a vinyl liner over the walls and bottom to hold the water.
This is the least expensive in-ground pool you can buy. The quality of these pools is a lot better today than just ten years ago. If built well it will last many decades.
Vinyl Liner has to be replaced every ten years ($3k to $5K). Pool liner can float due to ground water. Pool liner can color fade if your pool still uses salt or chlorine to sanitize the water. Pool liner can come “untucked”. Liners coming untucked is very common. Patches on vinyl liners are temporary at best.
This is a traditional Vinyl Swimming Pool but instead of a 10-year vinyl liner it has a 30-year fiberglass reinforced membrane.
A few thousand more than a regular vinyl pool but not anywhere close to the cost of a gunite or fiberglass pool. Membranes can’t come untucked. Membranes are integrally colored so color fade is less even if you still use chlorine or salt systems. Membranes allow for custom tanning ledges, etc.. Damages can be permanently patched.