Water out of tap PH of almost 9!!

[Wildman]

Can someone tell me why or what my options are?

 

[ritter6788]

A good 5 stage RO/DI unit. You don't want to use tap water in a reef..

 

[Wildman]

Yes sorry. Stressing a little. I have a RODI. Same PH though. Maybe .5 lower.

0 tds.

 

[kacrocorals581]

How many stages is your ro unit it should drop more than that. You can also use a acidic buffer to drop a bit

 

[Wildman]

5 stages. Pre, 2 carbon, RO, DI.
I didnt think carbon filters would drop PH?

I might be wrong because I have never had this problem but to drop it a full point would take a LOT of buffer would it not?

 

[kacrocorals581]

No carbon has nothing to do with ur ph. There something wrong with your unit the Ph of pure water is neutral 7ish this is because when your ro di works correctly it strips all the ions from the water leaving only pure water behind so you have a problem probably in your ro mimbrain

 

[kacrocorals581]

You should test your Ph with another kit first tho just to be sure

 

[Wildman]

Ok. Checked the probe with calibration fluid and it is off 0.6. I checked it when I reinstalled my Reefkeeper and it was right. After retesting everything the good news is my RODI water is 8. Tap water is about 8.5. Tank is a little high about 8.3.

Bad news is my probe has changed that much in just a few weeks. I will recalibrate it and see if it holds.

Thanks for the help guys.

 

[kacrocorals581]

You got it; )