Remineralization Cartridges: Thoughts?

[Aquattro]

Originally Posted by rayjay

Measurement of pH of RO/DI water will not give you a factual result because the pH reading is going to be dependent on salts in the water

No. pH measures the concentration of H+ ions in solution, not salts. RO, DI or other water can all be measured with a meter calibrated for the expected range. RO should be theoretically 7.0 and will be dependent on dissolved gases (O2, CO2) contributing ions to the mix.

TDS will measure salts and other dissolved solids in solution.

[rayjay]

Without any buffering salts in the water you won't get a proper pH reading.
http://reefkeeping.com/issues/2005-05/rhf/index.php#8

[Aquattro]

Originally Posted by rayjay

Without any buffering salts in the water you won't get a proper pH reading.
http://reefkeeping.com/issues/2005-05/rhf/index.php#8

Yes, you would. Pure water has a pH and is measurable. Acids are measurable. alkalis are measurable. All accurately, regardless of salts or lack of.

Anyway, not going to argue about it, the question wasn't about measuring pH. It's about does he need to buy a thingy? No, he does not.

[rayjay]

From the article, "The pH of highly purified water is not accurately measured by test kits, or by pH meters."
That doesn't mean there is no pH value, just that we have no method of measuring it and knowing the true value. Whatever reading you get with any of our methods of testing pH, it may or it may not accurately reflect the true value.
What method do you use that other hobbyists have access to that will definitely give a true reading?

[WarDog]

Rayjay, you are arguing with a guy who has a University degree In Water Quality Technology. Pretty sure he is the authority here.

[Aquattro]

Originally Posted by WarDog

Rayjay, you are arguing with a guy who has a University degree In Water Quality Technology. Pretty sure he is the authority here.

lol, you f'er. Let's say instead of authority, I know a lot about measuring water?
But there's no point arguing, doesn't matter in the context of the OP's question.

If I were inclined to read the article, I might offer an interpretation of what it's really saying, but I'm not inclined at the moment. I'm hungry.

[WarDog]

Food defuses everything!

[sphelps]

TripleT, I see you live in Calgary, why do you have acidic water? Calgary water is very hard with a pH of of over 8. At any rate as stated once mixed with salt you'll have everything you need in the water, even if you end up with a lower pH it won't matter. People who run Ca reactors can testify running a slightly lower pH won't do any harm.

[rayjay]

Originally Posted by WarDog

Rayjay, you are arguing with a guy who has a University degree In Water Quality Technology. Pretty sure he is the authority here.

No, he is arguing against what Randy Holmes-Farley has written in that article.
Unless he can produce something that makes me believe his qualifications are better than Randy's, I stick with Randy.

[Aquattro]

Tell ya what. You calibrate your Apex with 4 and 7 solution, make up some RO water, shake it a bit to off gas any CO2 and measure the pH. Tell me what you get.