1. determine where your pool is leaking (liner or plumbing) and repair.
Make sure the water around the pool is lower than the water in the pool..
The sun and the chlorine are the worst things for a liner but there is not much you can do about that try dissolving the chlorine in a bucket of water before adding to pool it does help some but as i said there is not much to stop it.
You need to throw down a 3 inch layer of pool sand then level it out a put your liner down.
Your period will continue when you get into the pool and thus you may leak into the pool unless you use internal menstrual products to stop this from happening - and you should stop this from happening! You can use tampons, soft tampons, menstrual sponges, menstrual cups, diaphragms, or softcups in order to go swimming on your period.
One way would be to install drain tile in the yard around the pool deck to carry excess ground water away from the pool.
you have to stop the continued exposure to chlorine. the damage done is done and can not be reversed. put a liner in the pool to stop the leaks, expose the foundation and apply a protective membrane or simply backfill and abandon the pool.
Patches can be used to stop leaks in inflatable pool ring. Use a patch that is especially for marine use. If the pool ring is leaking around the air nozzle, it can be remedied by putting a little Vaseline on the stopper before closing it.
The time to replace a pool liner is when you have had enough of the liner. That sounds a little flippant, so what the heck does that mean? Well there are several reasons to replace a liner any of which are valid and all relate to you the owner. The first most common reason to replace a liner is the pool is leaking and will not stop. You have hired a diver and they cannot find any leaks and leaks and will not stop or there is a major cut in the liner. The next most common reason is the printed pattern on the liner is substantially faded or gone. This happens from UV light exposure and high chlorine levels over the years. Most people just hate looking at a faded liner and want to but vibrancy back in their pools appearance. Another scenario is the pool water chemistry has been poorly maintained and the liner is badly wrinkled. With chemistry there are two critical balances Total Alkalinity and Calcium Hardness. If the Total Alkalinity & pH are kept too low over to long a period of time the liner will wrinkle badly and this problem can only be corrected by replacing the liner. If the Calcium Hardness is maintained too low for to long a period of time the liner can become brittle to the point if you step on it the liner would crack. So it is recommended that you have your pool water professionally tested at least 3 times a pool season if your season is 6 months long and 6 times a year if you have a 12-month season. The least common reason is the people just hate the pool liner pattern and want something different. This can happen if someone buys a house and hates the liner pattern that is currently in the pool when they purchase the house so they replace it. The average life of a liner is about 10 years. The longest I have ever heard of a pool liner lasting was 25 years this was an in ground pool, of course there was no pattern in the liner for the last 15 years but the owners did not care. So as you can see the time to replace the liner is your choice. Keep in mind when replacing a liner the thicker the liner the more resistant to punctures the liner will be. If you are in a cold climate you will need a really thick liner. Standard mil thickness on in ground pool liners is usually 20 mil, 27/28 mil, 30 mil and 40 mil. For above ground pools life expectancy is 5-10 years. Liner thickness generally runs 16 mil, 20 mil, 22 mil and 27 mil.
Repair the pipe of fixture to stop your leak.
Probably not. You would at least have to stop water getting through the leak to the part where you intend to do the repair otherwise the water will just stop the patch from sticking. If its a small hole try putting a suction cup over it on the inside to stop the water.
It sounds like there is a broken water line under the sand. Perhaps from a sprinker system?