Keep your filter in top shape with these Canadian Spa Company Glacier Pre Filter Screens. Designed as a part of the 10-step mountain pure filtration system, these screens are made to catch fine micro-particles before they even reach the filter. This way, you can maximize the use and lifespan of your filter and ensure that your spa water stays crystal clear for longer periods. To get the most out of your pre-filter screens, it's recommended to change them every three months (depending on usage). This will help maintain their efficiency and prevent clogging. Additionally, it's a good idea to clean the screens regularly to dissolve and remove grease, oil, and other contaminants that can accumulate on the screens over time. By following these simple steps, you can enjoy a cleaner, more refreshing spa experience every time. Pack of two.