ALK rising with our dosing

[Zbass]

the past few day is have noticed a rise in my DKH but nothing has changed. I still have the same amount of corals etc... some things I have changed are. I just added a protein skimmer last week, a UV sterilizer and GFO reactor due to my extremely high phosphates. would any of these additions cause this? 9.3ish is usually what my DKH is but it went from that on 2/15/25 to 10.35 on 2/19/25. what would cause this?

 

[Randy Holmes-Farley Verified Community Expert]

the past few day is have noticed a rise in my DKH but nothing has changed. I still have the same amount of corals etc... some things I have changed are. I just added a protein skimmer last week, a UV sterilizer and GFO reactor due to my extremely high phosphates. would any of these additions cause this? 9.3ish is usually what my DKH is but it went from that on 2/15/25 to 10.35 on 2/19/25. what would cause this?

Many things can change alk demand, such as pH which a skimmer may change or an large phosphate drop that the GFO might cause. It might also be test error. I would not agonize over the change, just adapt dosing to match the new need. :)