In most states, it is a legal requirement to have a fence around your pool to protect both swimmers and pool owners. These laws can vary by state, city, and county, so you must research the specific regulations in your area before installation. The rules may also differ for inground versus above-ground pools, with inground pools typically requiring a full fence. Additionally, most homeowners' insurance providers will require a fence around a residential pool before providing coverage. As a general rule, it's always best to have a fence for everyone's safety.

Technically, you can fill in a pool yourself—with the caveat that filling in a pool requires the ability to drain the pool properly and move a substantial amount of dirt, which aren’t beginner DIY skills. If you want to fill in a pool, you’re better off hiring a local pool removal professional.

An easy way to know whether your sand filter has enough sand is to check how full the filter is and what the sand looks and feels like. The filter container should be two-thirds to three-quarters full of sand. Look for interior marks indicating the ideal sand level. If you put your hand into the sand, it should flow through your fingers without clumping. The filter pressure gauge is also an easy indicator—the right amount of sand leads to normal pressure, while too much or too little sand can cause high or low pressure.

The formula you’ll use to measure your pool will differ based on the shape of your pool. For a rectangular pool, you’ll use the following formula to find the size in gallons: length x width x depth x 7.5. If the depth changes from one end of your pool to the other, take the average by finding the depth at the deepest and most shallow points and dividing that number by two. Circular and oval pools require different, more complicated formulas, which can be found in this article.