High PH out of RO/DI

[reefdope]

I have a number of questions I'm hoping someone can help me with:

1. Is it normal to get high PH out of RO/DI unit? I measured and recalibrated (Hanna) and did a manual test and all showed a PH of 9.2 straight out of the unit. This has lead to an extremly high 8.8 in my tank.

2. Not having a great understanding of PH (even tho I've read a number of things on it), what would the best way be to lower it?

3. Also, I always thought that PH was a measure of acidity vs. alkalinity, but I notice everyone measures for Alk and PH seperately...why, if its opposite ends of the same thing?

Maybe there's a good book on this that someone can point me to....for instance "reef chemistry for dummies" or something..

Thanks

Kev

[reefdope]

Maybe I should post the question a different way.....pH is one of the least important readings to take. If alkalinity is correct, then pH will also be correct, making the testing of pH unneccessary. True?

[reefdope]

What nobody?....I guess its a stupid newbie question.....

"pH of pure water (from a RO/DI unit) is hard to accurately measure with a pH meter, and the pH that you record may be.... spurious ......... The measured pH of my RO/DI water is higher than that (about 10), but it is quite clean based on it's measured conductivity." - Randy Homes-Farley.