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Salt is Reef crystals and 2 part is ESVWhat salt are you using? And is the tank in a place where the windows or doors are always open? Are you dosing anything?
Increasing aeration should help normalise it. Do you have a skimmer running? Are you growing a kelp forest, or loads of other algae’s?Salt is Reef crystals and 2 part is ESV
Alk is running at 7.7
I totally understand where youre coming from and ill cross check with another kit but it doesnt make sense when a brand new apex probe and calibration are reading the same as the replaced probeNot so fast, are you adding a product that has the affect of raising ph? Stopping or reducing that product may be the better solution than trying to lower your ph another way, whilst still adding the ph boosting product…and yes your reading could be wrong, even with a change of probe.
I have just tested my alk with the Hanna check, got a slightly high reading that I wasn’t expecting, so opened a new reagent bottle, got exactly the same reading! Did I attempt to lower my alk? No I tested it again with Salifert and aquaforest, both test kits gave the same reading of 1dkh lower than the Hanna, lesson is do not take any action until you are 100% sure of your test results.
Giving you the benefit of the doubt I am guessing you are not adding any ph boosting products, as you would then not be so sure your test results are correct, therefore leading me to think your reading of 9.1ph is indeed wrong.
Algae free and running a skimmer 24/7Increasing aeration should help normalise it. Do you have a skimmer running? Are you growing a kelp forest, or loads of other algae’s?
Sounds like you need to do the aeration test normally advised for folks with low pH, but this test would see if you can drive CO2 into the water to reduce the pH reading.Algae free and running a skimmer 24/7
No kalk or ph boosting additives are in useStop adding so much kalk?
If it's legitimately 9.1 (I have my doubts) - you need to be dosing significant volumes of something to raise it that high assuming you're starting out with RO/DI and salt mix. It doesn't climb that high on it's own.
Have you verified with a test kit?
There was an exact same thread to this, the op protested it wasn’t the probe, turned out it was the probe.I totally understand where youre coming from and ill cross check with another kit but it doesnt make sense when a brand new apex probe and calibration are reading the same as the replaced probe
No kalk or ph boosting additives are in use
I totally understand where youre coming from and ill cross check with another kit but it doesnt make sense when a brand new apex probe and calibration are reading the same as the replaced probe
How did you calibrate it? Manual or the automatic?I totally understand where youre coming from and ill cross check with another kit but it doesnt make sense when a brand new apex probe and calibration are reading the same as the replaced probe
I've seen pH reach 9 in a mature phyto culture, but that's probably from the phyto stripping out CO2, right?That makes a lot more sense than pH 9.1, which is 100% guaranteed error. Even if you massively overdosed super high pH alk supplements, when the pH hits high levels like that (as I have several times) precipitation of calcium carbonate and magnesium hydroxide turns the tank white like milk and also lowers pH again.
I've seen pH reach 9 in a mature phyto culture, but that's probably from the phyto stripping out CO2, right?
OP, I don't suppose your tank water is a very dark green color, is it? Assuming not and so as others have said it must be test error.
Never had much luck long term with any PH probe.
They work, then drift.
No long follow PH, I maximized what I could, and never measured it again.
9.1 is that even possible?
Possible with 20ppm CO2 (outdoor air is 400ppm). How you strip out that much CO2 is the challenge...