The optimum place to measure the pool's water level is at the skimmer assembly. The water level should be roughly one-third of the way below the skimmer's top. Setting the gauge too low will allow debris to clog the filter and need cleaning or replacing; setting it too high may cause the pump to run too often or hard, wasting energy and possibly damaging the pump.
In general, you want the water level in your pool to be between 1 and 2 feet above the lowest point of your pool. This gives your pool enough headroom that any debris that makes its way into the pool won't fall all the way to the bottom. Too high of a water level and you'll need to pay attention to what goes in to your pool. Too low of a water level and you might not be able to hear the alarm when someone enters your yard or breaks a glass object which could lead to drowning.
Some pools require a deeper or shallower water level depending on how you configure them. For example, if you have a spa-like pool then you'll need it to be deeper than normal so more people can use it at once. You can adjust the depth of your pool by using sand or water conditioners. These products will reduce the amount of sunlight that reaches the pool and thus require less frequent cleaning.
The water level in both in-ground and above-ground pools should be near the halfway of the pool skimmer, according to most pool pros. The skimmer is in charge of directing water flow to the filter, where it is cleaned. At least an inch of water is recommended for proper filtration.
The amount you put into your pool affects how often you need to change the water. If there are no children who will be swimming in the pool or no pets, then you can expect to change the water every other week during hot summer months and only once a month otherwise.
You should also check with your local government about their requirements for pool ownership. Some cities require that you purchase a pool cover to protect your furniture and belongings from getting wet.
Finally, make sure that you have the necessary skills to properly maintain your pool. Most major brands of above-ground pools include instructions for setting up the skimmer and cleaning the filters, so if you follow these steps, you shouldn't need help from a professional.
Most above-ground installation guidelines state that a pool should be level to within an inch, but I aim for an eighth of an inch or so. This allows for slight differences in water depth from side to side and front to back.
If you're installing an old-style concrete pool, this means the ground under it must be flat. Otherwise, you'll need to bring in rock or other material to level it off. Concrete pools are usually installed on a concrete slab, so they need to be sloped toward the house to allow water to drain away from the foundation.
The best way to make sure your pool is level is with a laser level. These devices emit a laser beam that bounces off any surface it touches, giving you an accurate reading in minutes instead of hours or days. They're inexpensive and available at home improvement stores.
Other ways to check level include the rope test and the tape measure test. For the rope test, take a length of rope and tie a simple knot about two feet from one end. Hold the other end over the edge of the pool and let it dangle down into the water. If the rope will not cross the pool without touching the sides, the pool is too deep.
Pool depth is measured from the bottom of the coping, the bottom of the 6 inch tiles, or 2-3 inches above the bottom of the skimmer. From the usual water level. Pool depth and volume are not important considerations. What matters is that you keep them large enough so that a person can swim comfortably.
The size of your pool will determine how deep it needs to be. The guidelines on this page are just that, guidelines. You should always be sure to check with your local authority on whether any rules have changed since these guidelines were published.
It's best to know exactly where the deepest part of your pool is so that you don't put anyone at risk by having them dive into an area that isn't safe. This is especially important if there are children around the pool.
People love to say that you shouldn't measure a pool until after a heavy rain because then the kiddie pools fill up. While it is true that the depth of a pool will usually increase after it has rained, this is only because the ground under the surface of the pool rises due to ground water flow. If you measure the pool before the rain then you'll need to add more water to make up for the increased depth. After the rain is over and the ground has returned to its original position, then you won't need to add any more water to maintain the same depth.