Apex DOS inaccurate?

[Chad_P]

Hello. Trying to dial in my alk with the balling method and tested this morning. Alk was a little low at 7.3 and I usually like to stay between 8.0-8.5. Been this way a few days and trying to slowly work my way back and not have big swings.

So I went to my dose and manually filled the Apex DOS graduated cylinder they give you for calibrating the heads. Added 25ml and dumped in the sump. Went back to look at my dosing log and at the time I did it, it’s saying I only doses 5.9ml? This is the second time I’ve noticed this where it doesn’t match what I actually measured out.

Heads are a few weeks hold and were calibrated. Any ideas why it doesn’t agree with what I measured out?

 

[reacclimating 2 the hobby]

Run the calibration through your apex.

 

[Chad_P]

Run the calibration through your apex.

Thanks. I did that a few weeks ago when I installed the new tubing and then a few nights ago because I noticed it last week. Each time it’s spot on with 40ml so this is weird.

 

[reacclimating 2 the hobby]

I agree, I haven't compared mine, but haven't seen anything to worry about either.

 

[Chad_P]

I agree, I haven't compared mine, but haven't seen anything to worry about either.

Yeah I never worried before should be good based on the calibration. But if I manually add 25ml and it only shows just under 6ml was dosed that’s a huge difference. Will see how this goes the next few days. Assuming what was dosed before my manual dose was correct I plant to take that and add to my manual does the next few days to get my dkh in line.