Randy Holmes-Farley
Reef Chemist
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Is my room so full of CO2 that dripping kalk hardly raises the ph? Probe was recalibrated and I'm dripping into the return chamber where the water flows over the glass partition into the return. It's not dripping on the glass but onto the water flowing over the glass. It seems if I drip into the display I'm seeing a tiny increase in pH but that just may be coincidence?
I'm mixing BRS kalk in 5 liters of RODI water at 2.5ish tsb's and stirring it till no solids on the bottom of the container. The pick up line in the container is high enough as to not suck up and fine dust. My dkh has been holding at 8.5 for 3 days and the pH is hanging around as of today 8.03.
The other night I observed the pH dropping so I raised the drip rate to compensate the drop.
Any suggestions on how much I should drip through out the 24hr period? I was around 800ml for 24 hrs. I'm now trying to set the dose to start 1 hr before lights out and turn off at 1:30pm as the lights would've been on to full ramp. This is what the program looks like now and started last night. The pH screen shot is ending the time from calibration so it's showing a 10 or so after calibration. pH of the mixed kalk if I recall was 12.73ish.
The size of the pH rise (as opposed to the starting pH point) is controlled by aeration (makes it smaller) and the amount dosed (more gives more rise), not the CO2 level. Enough aeration will eliminate any pH effect of any alk additive.