We buy one about every 2-3 years here in Arizona because of the hard water, even though we have a water softening system throughout the house. When the flow slows down to find that the reservoir glue isn't replenishing fast enough, it's time for a new diaphragm. We also buy this kit every year for annual maintenance. http://www.amazon.com/Watts-Premier-531105-RO-Pure-Annual/dp/B002YOQ0C2?ie=UTF8&redirect=true&ref_=cm_cr_ryp_prd_ttl_sol_66
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