What kind of filter is best for a large recreational pool?

A sand filter is considered the best option for a large recreational pool due to its efficiency, maintenance ease, and cost-effectiveness. Sand filters operate by using a bed of sand to trap dirt and debris as the water passes through. They can handle large volumes of water, making them suitable for bigger pools where water clarity is crucial for both safety and aesthetic appeal.

The design of sand filters allows for good flow rates and reduces the frequency of backwashing compared to other types of filters. They require less frequent cleaning and can operate for extended periods before needing maintenance, which is ideal for large, heavily used pools.

In contrast, while a cartridge filter can provide fine filtration, it typically requires more frequent cleaning and replacement of cartridges, which may be more time-consuming and costly in the long run for larger pools. A diatomaceous earth (DE) filter does offer superior filtration but can be more complex to maintain and operate, as it requires regular addition of DE powder after backwashing. A manual filter is not designed for large pool applications and is generally impractical due to its labor-intensive nature and limited capacity. Thus, for a large recreational pool, the sand filter stands out as the most practical and effective choice.