Man.... I wish I could have explain better or get better article to describe
it.
Oh well....

CapFusion,...


"Bill Kirkpatrick" wrote in message
...
Um, a general reply...

1) Simple "pass/fail" quality monitors a good addition to
RO. Particularly if you have a TFC membrane that you allow
to get eaten away by chlorine from an expended carbon
pre-filter.

2) Cold water produces more RO. I believe the reason is
less brownian motion. "Optimum" would be 1C.

3) Flush kits do not bypass the membrane, they bypass the
flow limiter.

4) Flush kits force a high flow of water across the dirty
water side of the membrane. This "shears" debris from the
surface, clearing pores, and prolonging life.

If you've ever flushed an old membrane, for the first time,
you'd be amazed at the gray goo that comes out of them. If
you can see it, and it was stuck "in there", it was/is
surely interfering with the membrane process.

5) I'm not sure what people have "found", but I assure you a
properly used $5 Flush valve is a worthy business decision,
relative to the extended life it brings to $50 membranes.
Payback is had on the very first membrane.

6) Auto-flush kits are quite expensive, you have to extend
your $50 membrane double, or triple, the expected life cycle
to pay for the $80 auto-flush kit. It might be a good
investment, but unlike the $5 deal, you'd really have to sit
down and do the math.

7) Flushing improves TDS rejection, slightly. RO works by
moving water tangentially across the membrane, 90 degrees
across the pore structure, at a given rate. Debris can slow
that flow locally, and solids will be able to force their
way through the pores.

8) RO's that produce many small batches, rather than one big
batch, are slightly dirtier. When idle, solids will migrate
to the clean side because there is no tangential flow to
"bounce them along". When RO flow starts, there is a short
peak of "dirty" water. The longer it sits, the closer to
the input water the peak will be.

9) A flush kit will improve waste ratio. The flow limiter
always dumps the same amount of water, in ml per minute. A
clogged membrane will let fewer ml per minute pass than a
clean one.

**************************
Dragon Slayer wrote:
I hate to disagree with you Cap but saying the flush kit will do
anything at
all is just (pardon my French) a bunch-ah-****.

that would be like saying if I took a garden hose and turned it on full
stream then went and stabbed a hole in the middle of the hose to allow
water
to come out, that the water coming out the end would be cleaner water.

the flush kit does not flush anything, it just allows more water to pass
around (not inside) the membrane housing.

kc

"CapFusion" wrote in message
...

[snip]

I've done some checking on flush kits, and everything I've found on the

topic

seems to indicate it is more hype than benefit. It does not rinse the

RO

membrane in any form or fashion. Others may have more comments on it.

It

isn't

difficult to install one, but I just don't see the need.


[/snip]
It better to flush it, the membrane will last longer. You do not want
bad
water to sit there to long.
A flush kit will reduce waste ratio, especially in low TDS while

maintaining

or improving systemTDS reject rate and extending membrane. The auto
flush
flushes the system for 18 seconds every hour removing damaging

particulates

from the membrane surface prolonging its life and rejection quality.

CapFusion,...