Kind of effective, it releases deadly biotoxins that slowly eat away at your skin... Scientists are currently running immense studies on this but have yet to find the culprit.
Yes buy using a wet under water repair kit
Hydralic cement?
no
There are several pool patch kits available at your local pool dealer...if the hole is not too big than this should work. It works under water.
no
Yes, but let a professional do the job correctly and to code.
Yes you can!
Yes, its called "Raycrete", its a 2 part epoxy type mix, designed to be used under water. I have used it and it works great. In addition: Depending on the size of the crack, another option is Prattley Putty, its sets as hard as concrete, even under water. and will be easier to use than epoxy. yes, there are many different kinds that can find at dolphin pool stores.
Chlorine is an effective agent against treating your pool against bacteria. You can buy supplies to test and treat your pool at pool shops.
Where to find pool enclosure repair depends on where you are currently. A good way to find pool enclosure repair is to go to google and type in near "your zip code", pool enclosure repair.
Many pools have vinyl liners. As the pool ages, the vinyl liner will oftentimes become cracked. These cracks cause water to drain out of the pool, which can result in greater damage. One should never fail to repair this type of leak. The best way to repair this is to patch the crack or hole with a patch kit. These patch kits can be bought both in stores and online. There are different types of patch kits, some of which are meant to be used above water and some below the water. This type of pool repair is relatively simple.
A Hydrostatic valve is basically a plug that stop water coming down out of the pool, but when the water pressure under the pool gets higher then the pressure in the pool it will let water into the pool from underneath in order to stop the pool from floating in ground water.