Concrete Swimming Pool
A concrete swimming pool and gunite swimming pool is both the same types of pool. They often install these types of pool in your backyard.
Koi pond is often built to use for keeping the koi fishes which is often keep at home as part of the landscaping features.
Vinyl Liner Pool
Vinyl liner refers only to the surface of the pool. They are using colorized chlorinated PVC thermoplastic vinyl as part of the waterproofing membrane.