Shipping container pools are prone to rust and corrosion over time, especially if you install a saltwater system. Though the interior of your pool should be lined, the outside is at risk. Luckily there are a few things you can do.

Elevate your pool or place it on a foundation to prevent moisture buildup along the bottom of the container. Apply a rust inhibitor or paint to protect the outside of your pool, and maintain the proper chlorine levels to reduce the rate of corrosion. Regularly inspect your pool for signs of corrosion, and take action when necessary. 

How long a pool liner lasts depends on the type of pool. Most in-ground pool liners last between six and 12 years, while aboveground pool liners last anywhere from six to 10 years. You can extend the life of your pool liner by maintaining proper pool chemistry, adding chemicals individually to avoid staining the liner, using a pool cover to protect it from the sun, and keeping sharp objects away from it.

Costs depend on size, additional features, and site preparation requirements.

Yes, you can put too much shock in a pool, and it is crucial to follow the directions on the product you are using. Adding excess shock can upset the chemical balance, make the water cloudy, have adverse effects on swimmers, damage pool equipment or surfaces, and even encourage certain types of algae to grow. If you have over-shocked your pool, perform a water test and adjust the chemicals as necessary. The pool's chemical balance will eventually return to normal as the excess chlorine dissipates over time.