Calibrated Orp probe 3 times to 400 - Drop in water it goes to 900+

14 foot reef

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Calibrated ORP probe 3 times to 400 - Drop in water it goes to 900+. Is there something possibly throwing this off? I don't think its possible to have an ORP that high in saltwater.
I am not running ozone, I run 250 watt UV, carbon, gfo, filter socks, Dual Beckett Pecision Marine XL4 skimmer, and dose Kalkwasser through a doser, not ATO.

Thanks for any thoughts on this. Corals and fish are doing fabulous!!

Temp 78
PH 8.8
Alk 11.2
Nitrate 10
PO4 .06

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MnFish1

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It is my experience (depending on the brand) - i.e. which ORP meter are you using - that they need to settle into a tank - and the ORP will drop gradually over several days. Once it levels out, you can get a trend. Frankly, I gave up on ORP a while back - it did not give much benefit (that I could see) - so I'm curious - why are you measuring it?
 
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14 foot reef

14 foot reef

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It is my experience (depending on the brand) - i.e. which ORP meter are you using - that they need to settle into a tank - and the ORP will drop gradually over several days. Once it levels out, you can get a trend. Frankly, I gave up on ORP a while back - it did not give much benefit (that I could see) - so I'm curious - why are you measuring it?
I have always found ORP to be a very good water clarity and quality meter. Its always run very stable until I upped my Kalwasser to raise Alk and PH. So I was thinking there is a connection with Kalkwasser and the ORP reading.
The ORP has been consistantly running this high for weeks.
 

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