- 1). Consider the size of your pool. If it is very large, for example, you likely will want to invest in a large, high-quality filter that will last for many years. Make sure to know your pool size before shopping for a new filter, since filters are sold based on a pool's square footage. If you already have a filter in your pool, use that as a size guide for the next one.
- 2). Take into account the type of pool. In-ground pools have more filter options than above-ground pools. Above-ground pools often operate with a cartridge-style filter, while in-ground pools use cartridge, sand or DE (diatomaceous earth) filters.
- 3). Weigh the benefits of sand filters. They're easy to use and are generally considered low-maintenance. Maintenance involves backwashing the filter about once a week and replacing the sand every three to five years.
- 4). Check into DE (diatomaceous earth) filters. These are made from ground-up fossils. They are the most effective type because they filter much smaller particles than other filters, according to Swim University.com. Because of the efficient filtration, frequent backwashing is required. Additionally, the DE powder must be replaced several times a year.
- 5). Consider cartridge filters. These filters use paper to catch contaminants in the water. According to Swim University.com, they are the least effective filtration system but are very easy to maintain. Every few months, the cartridges must be removed and sprayed clean with a hose. And every six months to a year, the entire cartridge usually needs replacement.
- 6). Talk to experts about the type of filter that's best for your pool. Many pool-supply stores have experts who can recommend a filter that will match your needs and budget.
- 7). Make sure to choose a filter that matches the level of use you plan for your pool.
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