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RE: RO waste water




Date: Fri, 6 Feb 1998 16:32:18 -0600
From: "Cymen Vig" <cymen at ziplink_net>
Subject: RO, deionization (lots of questions on deonization)

>Putting the RO waste back into a well is a Bad Idea.  Even if the wellhead
>time the pump came on.  Besides, returning water through a well is a
>regulated behavior in most places in the US and requires special permits.
>There might be other uses for the water.  For instance, it could be used
>for irrigation (depending on quality, season and local) used in a "grey
>water" system or stored for washdown (driveways, cars and so on).

[GeorgeM]   As I have lost the original post, depending on the size of your 
RO system that you wish to use, the one we use is a household unit, which 
supplies about 6 gals a day.  We fill gallon jugs with it, and store them 
at room temp for addition into a 75 gal system.  We use about 2 gals a 
week, we always have 4 that remain filled and ready.  The total amount of 
'waste water' out of this unit is about a gallon and a half a day and this 
would not amount to enough to justify the effort of adding it back into the 
well.
      It is important to know that the regen process of RO units require 
that the waste side of the regen process have NO backpressure on the line, 
this is one of the reasons for an open type drain, with an air gap for 
safety and prevent siphoning.   I have considered to same process to make 
the regen water from the RO unit fill a separate container for other uses, 
called 'gray water' mainly used for flushing toilets, or watering gardens, 
and found that the amount of new water I collected in a 30 gal plastic tank 
was minimal and did seem to stangnate rapidly.
     Should you wish to add this to your well tank, keep in mind that you 
would need a container that would not freeze in cold weather, a pumping 
system capable of exceeding the shut off pressure of the well pump, to 
transfer this to the well supply tank, as well as controls to keep the 
pumps from operating at the same time as well as making it an automatic 
process with assorted level controls on the waste tank.
     The system here has a water softerner upstream of the RO unit as well, 
and we have found that this prolongs the life of the RO elements, and well 
as protects the plumbing and fixtures in the home.  If your household water 
system has high hardness, this would be a plus for many other reasons.  It 
should be also noted that the RO unit here supplies a sink faucet and the 
icemaker in the refigerator.  At present has extended the life of the 
icemaker and coffee maker by years instead of months as well as preventing 
a lot of manual cleaning of these items, when they were used on just the 
softening system.
George McDonald
<georgem at NOSPAM_socketis.net>
(Delete NOSPAM. for correct email address)

- | -  A computers attentions span is only as long as its power cord ! ! ! 
 - | -

 

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