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reefnetworth
11/07/2006, 11:57 PM
which works better in a membrane? GAC or block?

Thanx, john. :confused:

Randy Holmes-Farley
11/08/2006, 06:27 AM
In a membrane? What sort of membrane?

You mean before an RO membrane?

reefnetworth
11/08/2006, 02:34 PM
pre and post DI membrane. i currently use GAC membrane before/after the DI membrane. i guess i should have included that, sorry. its a 1/4" line fed into GAC membrane then through the DI membrane then GAC again. would it be more beneficial to use a the block carbon on one end pre or post or both?

thanks,
john :confused:

reefnetworth
11/08/2006, 03:48 PM
sorry, please delete this one. accidently double posted. thank you, john. :lol:

Randy Holmes-Farley
11/09/2006, 10:05 AM
I don't see any strong reason to have carbon after the DI, but if you do you do not want back pressure, so a block would not be good. Use GAC for that. A good block type of filter is a lot better than GAC before the RO membrane.

This article has more:

Reverse Osmosis/Deionization Systems to Purify Tap Water for Reef Aquaria
http://reefkeeping.com/issues/2005-05/rhf/index.htm

Boomer
11/10/2006, 10:08 AM
Randy

I don't see any strong reason to have carbon after the DI

GAC post DI. This just came out today on my fourm. Reason, in case there is any break down of the DI is what some are thowing out.

Randy Holmes-Farley
11/10/2006, 03:03 PM
Why not use a second DI in series? I doubt the carbon will be especially effective if silicate or ammonia are coming out when the first DI gets depleted.

Boomer
11/10/2006, 04:01 PM
I agree, unless they are talking about the resin falling apart. Never heard of that.......you ?

Randy Holmes-Farley
11/10/2006, 04:36 PM
No, but maybe the placebo effect of piece of mind is valuable. :D

Boomer
11/11/2006, 12:42 AM
:rollface: :rollface: :rollface:

reefnetworth
11/11/2006, 09:41 AM
i change carbon, DI, every 150 gallons. i just was courious which would be the better of the two, block or GAC. and best location for them to be applied. thanx, have a great weekend.

John, :)

reefnetworth
11/11/2006, 09:46 AM
lol! Randy, good one! maybe im over-cautious. my nuerologist said i was bi-polar, i didnt think it would effect my choices of filterization!

John, :lol:

billsreef
11/11/2006, 10:31 AM
<a href=showthread.php?s=&postid=8520150#post8520150 target=_blank>Originally posted</a> by Randy Holmes-Farley
No, but maybe the placebo effect of piece of mind is valuable. :D

:lol:

Placebo's do have a use :D

reefnetworth
11/11/2006, 11:08 AM
and all it took was one bi-polar, anxiety dyfunctional person to ...
hang on a minute, i wonder if theyre giving me placebos? that could explain alot!

John, :lol:

billsreef
11/11/2006, 11:23 AM
:lol: