7800 Carbon Filter Installation & Startup Guide
Page 5
www.cleanwaterstore.com
Rev 120215
6.
You do not need unions to install your 7800 control valve. If you need to remove it, the 7800
has quick-release couplings that make it easy to put the Carbon filter on by-pass and remove the
filter system from the piping.
7.
The drain line tubing (not supplied) is connected to a drain from the drain outlet using flexible
½” ID tubing. Note that the drain can run up above the 7800 control and into a drain, it does
not have to drain down, as the filter backwashes under line pressure from your well pump. Most
plumbing codes require an air-gap connection, so that if your sewer or septic tank backs up, it
cannot cross connect with the drain tubing.
How Your Carbon Filter Works
See Fig 1 below. In your Carbon Filter the water enters the top of the tank (red arrows) and flows down
through the media and up the distributor tube (blue arrows). The downflow type Carbon Filter
removes sediment and can be backwashed, which cleans and re-classifies the Carbon, preventing
channeling. During backwash the flow of water is reversed and water flows down the distributor tube
and up through the media, lifting and expanding the Carbon media. During the backwash the Carbon is
cleaned by the action of the water flowing through it.
Fig 1 - Carbon Filter Tank Water Flow
