PH went down on RA

[Armetas]

Hi,

I don't know what happened but PH went down from 7,6-8,3 to < 5 in few days. Thought that it was due to unclean electrode, but today it was cleaned (in cleaning solution) and re-calibrated (with 7 and 10 liquids), but still getting same numbers (< 5, at the moment 2,5). So took another probe (new one) to test - same result here.

After such experiments - I took another PH meter and it showed normal PH - 8,12.

So could you please explain what is happening with the ReefAngel and how to fix this.

Thanks in advance.

Attaching chart from portal

[Piper]

That is typically caused by stray voltage. Put your probe in a glass of tank water and see if it goes back up to normal. If it does you will need to start unplugging devices until you find the culprit.

That just happened to my tank and I found I had a bad temp probe. As soon as I pulled the temp probe out the pH went back up to normal.

~Charlie

[Armetas]

Thank you very much. Found - ATO high does this. Ok need to replace this ato

[mask0017]

Iv'e had same replaced ATO switch on high twice in 2 months.
Always seems to be high port problem is with.
Now run single switch ATO low port seems to run better with that

mask