The Pleatco Disposable Pre-Filter is a sediment filter that filters water as you fill or top off your pool or spa to remove any trace metals and minerals that can cause build-up, scale and staining on pool or spa surfaces. The Pleatco Pre-Filter is designed to provide sparkling clear water from the start by using Pleatco Advanced Point Bonded Filtration Fabric to remove solids, hard mineral deposits, and stain causing trace metals. Pre-filtering your fill water is perfect when refilling or topping off pools and spas after liner changes, repainting and spring start-ups. The use of a Pleatco Pre-Filter also reduces the need and use of stain and scale chemicals, expenses, and chemical dosing, making it ideal for pools and spas using well water. The Pre-Filter easily threads onto any standard garden hose and can be used to filter a one-time water capacity of up to 40,000 gallons or multiple times with smaller amounts of water. Compatible with any standard garden hose, in ground pools, above ground pools and spas.