1x Replacement Calcium Lime Scale Reduction Filter Set . The system must be kept vertical when operating it and it is best to mount it using the mounting bracket supplied with the system to avoid it toppling over. If your local water has high levels of sediment you may need to use a sediment reduction filter before this unit to stop the carbon block from clogging with sediment and slowing the flow. If you need help with this let us know and we'll assist. Pictures 2 in the listing is a picture of the system that this replacement filter set is used with and is not included in this listing. Pictures 2-12 are of other items we sell which you can purchase by visiting our store. This product has a 30-day no questions asked, money back guarantee. Simply return the product to us in original condition and in any original packaging to receive a refund or replacement. If you are testing a filter to see if it fits please leave it in the original wrapping until you are sure that it fits. Note that depending on the condition of the item upon return a handling fee may apply for any necessary repairs or replacements that may be required to bring the item back to a saleable condition. Note also that a handling fee may be applicable for units of high complexity such as commercial or industrial style units. Unless stated otherwise in a listing or unless you have bought an extended warranty our standard warranty on all systems and parts [not filters which are considered consumables covered under our no questions asked 30 day refund guarantee] is 12 months and covers the item for any workmanship defects as long as you follow the operating instructions, change all filters and consumables as recommended and the item has not been damaged due to neglect or similar reasons. The maximum recommend life of any water filter and reverse osmosis system regardless of the supplier, the installation or the system is 10 years.