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Re: Fishroom Tragedy



LeeH920226 at aol_com wrote:
> 
> In a message dated 1/24/02 2:56:44 AM, tcook at eos_net writes:
> 
> <<  I also put some R.O. water in a jar and put a few worms in it and within
> about one hour the worms were not moving. >>
> 
> I don't know how white worms survive in "good" RO water, so I'm not sure what
> this means. 

Many things kill nematodes that are quite harmless to fish. They are *not* a
good "mine canary."

> Another thought/question occurred to me -- chlorine is excluded
> from the water by the RO membrane, right? 

Nope. Chlorine, ammonia and chloramine are small enough to get right through.
RO membranes don't block them, AFAIK. My RO system has three carbon filters in
addition to the inlet sediment cartridge. One pre-filter, one post, and a
smaller one in the RO outlet line.

> Also, the cellulose triacetate
> (CTA) membranes require the chlorine to prevent bacterial attack - right? So
> where in the system is the carbon filter -- before or after the RO membrane?

In that case, usually after, I think. I've never used CTA, to my knowledge.

> With the TFC membranes the chlorine is not essential. I ask these questions
> because my RO unit does not have a carbon filter so I have to dechlorinate
> the waste water to use it where appropriate. I want to install a carbon
> filter to get rid of the chlorine in the waste water and need some advice on
> placement (I assume after the RO CTA unit) and type.

Be advised that you will still have it in your RO water, unless that branch
has a carbon filter, too. The standard household filters at Home Depot o/e are
just fine, and the carbon cartridges for taste and odor in drinking water do a
pretty good job. For the RO water, one of the little cartridges designed for
ice-makers might be ideal. It should last a loooong time.

There's absolutely no comparable substitute for a simple pool chlorine test
kit, tho. Use it often and avoid catastrophe.

Wright

-- 
Wright Huntley -- 650 843-1240 -- 866 Clara Dr. Palo Alto CA 94303 
                    http://www.sfbaka.net.

Nobody every recommended a dictatorship aiming at ends other than
those he himself approved. He who advocates dictatorship always 
advocates the unrestricted rule of his own will.  Ludwig von Mises

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