Which type of algae is known for causing clogging issues in filter beds?

The correct answer is diatoms, which are a type of algae that can lead to significant clogging issues in filter beds. Diatoms are unique in that they possess a silica-based cell wall, known as a frustule, which can accumulate in filtration systems. When they die or multiply excessively, they can create a dense biomass that clogs the filter media, reducing flow rates and increasing the pressure within the filtering system. The presence of diatoms can also alter the chemistry of the water and affect the efficiency of the filtration process.

In contrast, green algae, blue-green algae, and red algae typically do not cause the same level of clogging problems in commercial filter systems as diatoms do. While these types of algae can proliferate in water bodies and may contribute to other issues such as taste, odor, or nutrient loading, their physical structure does not lead to the same dense and problematic accumulations that diatoms can cause in filter beds. This distinction is crucial for operators to understand in order to effectively manage water treatment systems and maintain optimal performance.