HELP WITH PH! 9.0!
- Thread starter JACK50REEF
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Diesel
ME=1, CANCER=0.
IMO and I know @Randy Holmes-Farley is that your PH isn't that high as you measured.
Of course a good water change never hurts.
You can show us a pic of your tank?
Of course a good water change never hurts.
You can show us a pic of your tank?
Randy Holmes-Farley
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If you dosed what you said you did, the pH is not high, a water change is neither useful nor necessary, and the livestock are fine. 
JACK50REEF
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Nope.. Just figured out what happened. Idk how my pinpoint and my hm reader can both be off at 9.0 each. The only reason my redsea was reading such a high ph was because i had some buffer residue in the same syringe i pulled 5 ml for testing.. That's why it was throwing off my readings. To everyone on this forum that helped me... I appreciate it much!
Randy Holmes-Farley
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No.
Assuming it is 0-1 ppm TDs water (that is, the RO/DI is working) and you did not add anything to it, then you are not capable of measuring the pH of such pure water with any kit or meter that you'd likely own, and it does not impact the tank water pH. Mine also reads high, but that is not likely real. A slight bit of anything can skew the pH a lot, including just a bit of salt water on the probe.
I discuss it here:
Reverse Osmosis/Deionization Systems to Purify Tap Water for Reef Aquaria by Randy Holmes-Farley - Reefkeeping.com
http://reefkeeping.com/issues/2005-05/rhf/index.htm
from it:
Final Effluent pH
Aside from the issues discussed above concerning the effluent’s pH when the DI resin becomes depleted, the final pH coming out of an RO/DI system should not significantly concern reef aquarists. Many aquarists with low pH problems have asked, for example, if their aquarium’s low pH may be caused by their replacing evaporated water with RO/DI water that they measure to have a pH below 7. In short, the answer is no, this is not a cause of low pH nor is it something to be generally concerned about, for the following reasons:
1. The pH of totally pure water is around 7 (with the exact value depending on temperature). As carbon dioxide from the atmosphere enters the water, the pH drops into the 6’s and even into the 5’s, depending on the amount of CO2. At saturation with the level of CO2 in normal (outside) air, the pH would be about 5.66. Indoor air often has even more CO2, and the pH can drop a bit lower, into the 5’s. Consequently, the pH of highly purified water coming from an RO/DI unit is expected to be in the pH 5-7 range.
2. 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.
3. The pH of the combination of two solutions does not necessarily reflect the average (not even a weighted average) of their two pH values. The final pH of a mixture may actually not even be between the pH’s of the two solutions when combined. Consequently, adding pH 7 pure water to pH 8.2 seawater may not even result in a pH below 8.2, but rather might be higher than 8.2 (for complex reasons relating to the acidity of bicarbonate in seawater vs. freshwater).
Recharging DI Resins
