Any number between 7.2 and 7.8 is an ideal pH for swimming pools or 80 to 120 ppm. Your pool testing kit should be able to measure both of these numbers. If your pool’s pH is below this range, the water is too acidic and can cause scaling and damage to pool equipment. If the water’s pH is above this range, it can decrease the effectiveness of necessary chemicals, like chlorine.

Some pool professionals recommend adding an extra layer of comfort and protection between your pool and the vinyl liner. Made from a range of plastic blends, these liners can absorb moisture, allow the pool liner to breathe, and act as an extra barrier for pests, burrowing animals, and mildew. They also provide an extra layer of comfort for swimmers.

How often you should add water to your pool depends on how quickly the water evaporates. Keep an eye on your skimmer box, if you have one. Top up the water in your pool if you notice the water levels are lower than the bottom third of your skimmer. This helps prevent damage to your pump. 

Replace all the water in your pool every five to seven years, depending on how often you use your pool, the weather, and whether or not you close your pool for the winter.

To find a leak in a small pool, place a few drops of food coloring in a random area. If the food coloring flows out, you've found your leak. However, this can be time-consuming and impractical in larger pools. The best option is to hire a pool repair specialist with ultrasonic equipment.