ao smith 2.5"x10" 40 micron sediment water filter replacement cartridge - 2 pack - for whole house filtration systems - ao-wh-pre-rpp2 ao smith price is for one two pack as shown. filter for use with: whole house sediment filter (ao-wh-prev or ao-wh-pre). use only certified, genuine a. o. smith filters for continued contaminant removal and system performance. longer lasting appliances - whole house filter system designed to reduce sediment from every tap. universal fit - fits most 10-in x 2.5-in whole house drop in style filter systems from major brands including ge, culligan, dupont, brita, omnifilter, whirlpool and others filters down to 40 microns, the lower the micron the more contaminants are caught and reduced replace filter every 6 months for best filtration results universal 2.5-in replacement filter fits a. o. smith whole house system ao-wh-pre, ao-wh-prev, whirlpool whkf-dwhv, whkf-dwh and most major filtration brands filters are nsf certified to standards 42. filters 40 micron filtration - reduces sediment visible to the naked eye. replacements made easy - no plumber necessary. replace filter every 6 months. standard capacity (2.5") filter is perfect for household sizes of 1-4 people. includes 2-pack of replacement sediment filters.