High Alkalinity

[Scottiemac]

I've been doing 2-part and everything has been mostly fine until the last week. While I'm in the 8-12 range, I like to keep between 9.5-11. This past week I've been consistently over 11 despite adding no alkalinity via the Dosetronic.

The pump for my Kalk reactor goes on at pH 8.25 and off at 8.3. It runs about every hour and a half for about 15 minutes at 60ml/M. I'm using Avast kalkwasser original formula, if it makes a difference.

The Alk had consistently held in the 10-11 range, occasionally going over 11 but then coming back down. Since the 14th it has not come back down. When it's over 11 it no longer adds any Alkalinity, and I have confirmed this both by the Dosetronic log and visual inspection of the reservoir.

Can someone explain why this would be happening? One possible factor is that with springtime, the windows have been open more, thus reducing CO2 levels in the house.

 

[Miami Reef]

Kalk also adds alkalinity.

 

[Scottiemac]

Kalk also adds alkalinity.

Indeed it does. I'm just wondering why now, all of the sudden, it's decided to push it above 11.

 

[Uncle99]

Test probe error?

 

[Randy Holmes-Farley Verified Community Expert]

Could be lots of things.

I’m not sure which is typically most controlling for the kalkwasser (low pH or high pH) but if the lower air CO2 makes that controlled processes deliver more of the time than it previously did, then the alk may rise.