The type of filter that is recommended for small communities and rural places is which of the following?

The slow sand filter is often recommended for small communities and rural places due to several practical advantages. This type of filter operates effectively at a lower flow rate, making it suitable for smaller populations where water demands might not justify the installation of more complex or higher-capacity systems.

Slow sand filters utilize a natural biological process, where a layer of biological growth known as the schmutzdecke forms on the top of the sand. This layer aids in the removal of pathogens and particulates from water as it passes through the sand layer. This capability promotes a high level of water quality without requiring extensive mechanical operations or maintenance that may not be feasible for smaller communities.

Additionally, slow sand filters are relatively simple to construct and operate, using locally sourced materials. Their low-energy requirements make them particularly useful in areas that may not have access to advanced infrastructure or consistent power supply.

In contrast, other types of filters like rapid sand filters and pressure filters generally require more infrastructure and resource investment, which may not be sustainable or practical for small communities. Diatomaceous earth filters, while effective, also involve higher operational costs and maintenance demands that could be prohibitive in rural settings.