Patent ID: 9545586
Date: 2017-01-17
CPC Classifications: C02F

Claim:
1. A method of replacing filter media within a water filtration system that includes a housing that contains four filter media, wherein a first filter medium is less dense than a second filter medium, the second filter medium is less dense than a third filter medium; and the third filter medium is less dense than a fourth filter medium, the method comprising: disconnecting a drain line port from a drain to provide access to the four filter media in the housing and removing a drain line flow control from the drain line port; providing water into the housing to back flush the first filter medium and the second filter medium out of the housing through the drain line port without flushing the third filter medium and the fourth filter medium out of the housing; providing a new second filter medium and a new first filter medium into the housing through the drain line port; replacing the drain line flow control; and connecting the drain line port to the drain.