This spa fill filter is 9' 3/4" . It works by trapping fine particles and simply attaches to your garden hose when re-filling your spa, and is re-usable! Filling the spa with clean water quality will help minimize stains and scaling, and also makes it easier for water balancing. Highly recommended for use if filling from a well as your source water, if water is hard or if using a bromine salt generator.
Refilled my hot tub with this as soon as I got it, and I could already tell there was a difference in the water right from the start compared to my regular hose water. I think this will make dealing with my hot tub chemistry easier!