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All depends on what you are looking for and how much you have to spend. Concrete pools are usually considered the "high-end" pool but installation takes a long time and maintenance and repair are costly. Steel pools, or I'm assuming you're referring the vinyl liner pools, are a good, cost efficient option. Though, if you want to extend the life span of your pool, check out the other building materials used for vinyl liner pools.. such as Fiber Reinforced Composite Materials.
A concrete pool is better any where if it is done professionally.
I have had an OVATION brand pool up for 10 years now and see no signs of aging. The walls aren't rotting and its galvanized steel. As long as you buy a galvanized steel wall pool it will last years....many brands out there.
There does not appear to be anything that can be put in your pool to redeye your concrete in the pool dark blue. This can only be achieved by draining the pool and painting the concrete a dark blue color.
by taking the liner away!
You have to look for the cause and remedy that first otherwise you will be repairing the concrete over and over. The cause of the deck to "heave" is probably a leak in your pool or pool plumbing.
concrete
Yes it can be done
If you mean can a concrete pool pop up out of the ground then the answer is Yes it can. All you need is an empty or partially empty concrete pool and a lot of ground water around it once the ground water around the outside of the pool builds up enough the pool will start to float. I have seen it happen several times over the years. To avoid this happening most pools have a hydrostatic valve fitted in the bottom of the pool to allow ground water into the pool when there is a build up of water pressure outside the pool it flows into the pool to stop it from floating.
No. An older (possibly better) type of Fiberglass pool was constructed in this manner, with a concrete/Gunnite/Marcite trowled bottom and Fiberglass panels at the side of the pool. Panels are caulked together along vertical joints. Actually not a bad deal, but caulked joints must be maintained. Once the concrete starts showing through at the bottom of the pool, its time to drain and resurface. Bottom of pool should be acid washed every 3-5 years to keep it sparkling and remove mold, mildew, stains. If bottom surface is chipping off, its getting close to time to resurface bottom of pool. Bottom is treated just like any concrete/gunite/Marcite pool surface. Sides are simply brushed, caulked in timely manner.
The experts at Advanced Pool Coatings have been installing fiberglass coatings over vinyl liner pools for over 30 years. You can read more at: http://www.advancedpoolcoatings.com.
Pool Pumps are designed and built to work hard. You may create some additional back pressure by adding solar panels. as long as the pump is sufficient to fill the solar panels with water you should have no harm done by adding solar to your pool