There are several types of spa filters, but the two main types are:
These filters are made of a pleated polyester fabric that can trap and hold small particles from the water. The pleating increases the filtering surface area, allowing it to capture more debris. These filters are relatively easy to clean and maintain.
Micron filters are made of a fine mesh material that can capture even smaller particles than polyester pleated filters. These filters typically have a higher filtration rating, which means they are more effective at removing contaminants from the water.
However, they are disposable and should be replaced every 3-5 months. You can recognize a micron filters by its distinctive honeycomb appearance.
Ceramic material is used in some filters but is much less common.