Keep your spa water clean and your inflatable hot tub performing at its best with this hot tub filter. It puts less strain on the filter pump and traps additional dirt and particles within the filter paper. Clean your filter every 120 hours by soaking it overnight in a filter bath. Once you're ready for a dip in your personal spa, reinstall your filter and get ready for the ultimate relaxation experience. The filter cartridge is easy to replace and only needs to be changed once per month. When you buy our 12-pack, you get a year worth of replacements at a better price and without constantly having to undergo the ship-and-order process monthly. Regular hot tub immersion provides countless health benefits, including reduced stress and anxiety, better sleep, reduced muscular and joint pain, and more. Personal hot tubs are ideal for people who live with chronic pain, athletes, people who suffer from insomnia, families, and more.