Ecoone advanced HOSE filter easily connects to any garden hose and solves most pool and spa start up issues without the use of harsh chemicals (such as metal removers) by removing or reducing most common water contaminants before they get into your pool or spa. This filter has many other applications such as filling up fish ponds, fountains, fish tank, bird baths, pet water dish, watering lawn, washing cats, boats, motorcycles. Lots of use! Excellent for organic gardening, camping and RVs.