IPW Industries Inc. Whole House Sediment Replacement Filter compatible with the AO Smith System (AO-WH-PREV or AO-WH-PRE). Longer lasting appliances - whole house filter system designed to reduce sediment from every tap. 20 micron filtration - reduces sediment smaller than the human eye can see. Replacements made easy - no plumber necessary. Replace filter every 3 months. Standard capacity (2.5") filter is perfect for household sizes of 1-4 people. Includes 2-pack of replacement 10" x 2.5" sediment filters. Additional Details ------------------------------ Bullet point: Longer lasting appliances - whole house filter system designed to reduce sediment from every tap.|20 micron filtration - reduces sediment smaller than the human eye can see.|Replacements made easy - no plumber necessary. Replace filter every 3 months.|Standard capacity (2.5") filter is perfect for household sizes of 1-4 people.|Includes 2-pack of replacement 10" x 2.5" sediment filters.