Sorry about the incomplete post.
I hit <SEND> before the thought was complete.....
In Southern Arizona, water's the important resource.
Easiest, ( and most successful ) is to save washing machine water.
Have the machine empty into a 55 gallon drum on the back porch.
The simplest use is to use the water to drip-feed the garden.
The more elaborate installations pump the water to an overhead holding tank.
From there, it's gravity fed to the toilets, where it's used to "flush".
Having struggle through the info on GFX website, it looks like fouling
(at least from what they say) is not a problem due to the very high
As opposed to a "flooded" heat exchanger where flow velocity is much
I concur, with a heat exchanger that never floods, the water velocity
down the walls is VERY VERY rapid. Solids will tend to bump the sides
infrequently as they fall thru the 3 to 6 foot length. GFX has
documented installations that include blackwater processing that have
been in continuous service for 5-9 years with NO clogging, no cleaning
needed. Since the installation method uses clamps, it would then be
easy to open one up after a few years to see what gunk is caked to the
But with the water velocity quoted, even a small about of residue that
sticks when a solid bumps the wall will be quickly washed away by the
rapidly flowing water
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