The Bestway Filter Cartridge Cleaner is the tool for the compulsory job of cleaning your pump’s filter cartridges. Filter cartridges need to be cleaned every 3 days in the height of the season to ensure that your spa water is at its optimum level of cleanliness and purity; this cleaner makes it quicker, simpler and more enjoyable… meaning you have more time to enjoy your Lay-Z-Spa.