Call the builder. Warranty. I will add, if contractor refuses to fix call the contractors license board for a license review and state your problem including dates of completion etc. This pool system should have been inspected by a city or county rep. The conduit or connectors must not have been properly attached. Most states require a solid red brass conduit from the light to a junction box located a few feet from the edge of the pool deck.
This you must do right away with out delay!
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Is the skimmer plastic? Does it have a black bottom? If so, there is a kit for this. Check out black bottom skimmer repair - search.
Depending on how badly it is broken
used to repair the ceilings
A reputed recipe for pool plaster on a gunite pool is 1 part white cement to 2 parts white (preferably quartz or silica) sand. You should probably also add a bonding agent to the mix to make sure that your new plaster adheres to the old. All of these can be found at pretty much any home repair or hardware store. Mix the dry ingredients first and then make a shallow depression and gradually add water till you have the consistency similar to chunky peanut butter. Add the bonding agent per the instructions on the package and you are ready to go. Good luck!
First you have to identify the fluid that is leaking then locate the source of the leak before we can tell you how to repair it.
Break away the concrete until you find the leaking area then repair. Re fill with new concrete.
Some typical radiator repair jobs are leaking hoses, leaking radiators or loose connections.
Gunite is a mixture of water, cement, and sand applied through a pressure hose to produce a dense layer of concrete. This is used most often to line tunnels and repair structures.
Replace the leaking part
There is not much you can do for a leaky fuel injector but they do not cost much, they only run around 20 dollars.
You will be better off replacing it that trying to repair it.
Replaster!