This 100 Square Foot Cartridge filter features a tool-less lock ring and is made out of corrosive resistant material. Our cartridge filters are perfect for any features with the capability of 1 gallon per minute per square foot. Our tanks are made from corrosion proof ABS plastic and feature easy ring lock cleaning without tools. Includes 1 element. When it comes to buying water cartridge filters it very important that you need the right size filter. Advantage sells replace filters for our cartridge filters. With the start of the summer season and once every 3 months or sooner, depending on your needs and the condition of the filter. Some filter cartridges can be cleaned once prior to replacement, however, you should be aware that the filter will not function as well as a brand new filter. With over time, the fibers in the reemay can become clogged with particles and flow rates decrease. This can lead to a dirtier water. With Advantage Manufacturing, you can find the water filters you need at a great price so your water stays clean and clear all season long. Includes a one year warranty and you can extend the warranty for $39 each additional year. MAXIMUM WORKING PRESSURE FOR ALL MODELS 40 PSI Element Product Code: ELE100 100 SQ FT Filter Element, 7 1/4" x 21 5/8" CAUTION: All suction and discharge valves must be open when starting the system. Failure to do so could cause severe personal injury and/or property damage. Be sure locking knob is secure (hand tighten-only, slight pressure is required). Return Shipping is the Responsibility of the Buyer ***Returning Merchandise will be accepted only for defective merchandise.*** Free Shipping within the continental USA does not include Hawaii or Alaska We do not ship to Guam or Puerto Rico