Hello

"Hello! That has been my argument all along, since my unit doesn't have a DI
canister. "


You have been arguing on the pH of RO/DI units through this discussion. I have not argued
about your RO pH you are assuming that I am. Here, let me help your read your own posts
and comments



"Admit that I'm wrong? You just admitted in another post that I was right."

No and yes. You are confused on the difference between RO and RO/DI water



ME
"want to tell some reefers who's RO/DI water is a pH of 8 or 9 that it is a
real value"

YOU
" I know of no one who is using RO water who is getting a pH of 8-9 "


I said RO/DI and NOT RO


YOU
"You said that "You CAN NOT
measure the pH of RO/D water, there is nothing in the water to measure the pH.
The readings are false, until it has some "salts" in it." And I've responded
here that that is simply bonk, since RO water certainly does have something in
it, especially if the source water contains CO2 in solution. Even RO
manufacturers report that the pH of RO water is often low (i.e., 4-5). They do
not say that the readings are false.

You are arguing about the pH of RO and RO/DI water as if they are the same. The are not
the same. And as if meters or test kits are accurate on their pH measurements.

There are many more


If you want to make a point on a board or NG you better start quoting people exactly
rather than saying some one said x, y or z.

Some further comments about RO/DI water for you on CO2

The DI has cationic and anionic exchangers, they are H+ and OH-

The OH exchanger/water reacts with CO2 and forms HCO3-, an anion.

The following reactions take place;

H20 + CO2 ---- H2CO3 --- H+ + HCO3-

And this HCO3- ion then kicks out the OH -and replaces it in the exchanger. This is how a
OH exchanger removes CO2 from the water. Some of this "OH" exchanged water, before it
leaves the exchanger, can react with some of the CO2 and produce again HCO3- ( OH- + CO2
--- HCO3-) kicking out more OH-. This can be a real issue for those that have certain
types of well water with high CO2, as the anionic exchanger becomes depleted rather
quickly do to high CO2 in the source water.


The pH of highly purified water is not accurately measured by test kits, or by pH meters.
There are several different reasons for this, including the fact that highly purified
water has very little buffering capacity, so its pH is easily changed. Even the acidity or
basicity of a pH test kit's indicator dye is enough to alter pure water's measured pH. As
for pH meters, the probes themselves do not function well in the very low ionic strength
of pure freshwater, and trace impurities on them can swing the pH around quite a bit.


Boomer

Want to talk chemistry ? The Reef Chemistry Forum
http://www.reefcentral.com/vbulletin/index.php


Former US Army Bomb Technician (EOD)
Member; IABTI, NATEODA, WEODF, ISEE & IPS

If You See Me Running You Better Catch-Up


"George" wrote in message
news:EVvde.41926$NU4.38141@attbi_s22...
:
: "Boomer" wrote in message
: ...
: " And looking good in front of you or anyone else is a
: non-sequitur"
:
: I have done nothing but make you look bad and everyone knows it, including
: you.
:
: And I didn't accuse you of doing so, did I?
:
: That is
: part of the problem with a guy like you can't admit when wrong,
:
: Admit that I'm wrong? You just admitted in another post that I was right.
:
: Quote:
:
: "RO water IS NOT the same as RO/DI water. RO/DI water has a DI canister for
: further
: filtration. RO water, coming from in lets say average tap water supply, will
: have about
: 5-10 ppm TDS, while RO/DI water will about 0 TDS. Measuring the pH of most home
: RO waters
: is fine and yes you can believe the kit for most RO, as it still has enough ions
: on it."
:
: Hello! That has been my argument all along, since my unit doesn't have a DI
: canister.
:
: