Sources of pH increase

[ozy]

What are the sources for pH increase in a reef tank besides the addition of kalk?

[May&Bruce]

do you mean you want to increase the pH? Can get a pH buffer additive to take your pH up to 8.3......Aquapharm, Seachem(?), have products if you don't mind adding chemicals into the water

[ozy]

Apologies for my unclear question. Actually I am facing a problem with rising pH. I don't dose kalk that much and I don't use buffer at all.

It is just a little puzzling to me because my pH has been constantly rising over the pass few weeks. Just want to know what may be causing the increase.

[johntanjm]

ammonia is alkaline, so that might be the cause of the rise in pH. Dose a good buffer if u wanna keep the pH stable. please note that buffers do not necessarily alter pH, it just keeps it stable.

i can explain why pH drops, but not why it rises except what i mentioned. anybody can shed some light on sea water chemistry?

[May&Bruce]

what level is your pH increasing too? It's a mystery why it is increasing - most of us have the opposite problem

[ozy]

it was around 8.32 when i first use a ph monitor. it has increase to 8.55 over the past 2 weeks.

[Tigger]

Is yr pH meter calibrated in the 1st place?

[May&Bruce]

could the pH monitor be faulty?

[ozy]

That was my first assumption, but I verified with my handheld meter, though not exactly the same reading, but it is close enough I have also calibrated my monitor prior to use.

[madmac]

Have you come across this article : High pH : Causes and cures... good read.

from it : "Nearly all high pH situations encountered in reef aquaria are caused by a carbon dioxide deficiency."