KH Director

Dawsokj1988 · Mar 15, 2018

double post.

scuzy · Mar 15, 2018

Could the bubbles be morning condensation? Weird i don't get that in mine.

Dawsokj1988 · Mar 15, 2018

I figured it out. There's a thread on the official GHL forums about it. It's the reagent and an issue with temperature swings during shipping. They're working it out.

Gaël · Mar 15, 2018

http://forum.aquariumcomputer.com/showthread.php?13231-Big-bubble-forming-in-doser-to-reagent-tube

Matthias (GHL Support Team):
" There is no general "bubble problem". We shipped > 2000 bottles with "white" reagent so far and it seems a few of them were affected due to high temp. swings during transport. Also most of the white reagent was treated in a special way to reduce the potential of air in it."
http://forum.aquariumcomputer.com/showthread.php?13360-New-reagent-with-different-color

Dawsokj1988 · Mar 15, 2018

Bingo!

Support@GHLUSA · Mar 15, 2018

I’m wondering, is there any chance that your reagent suction line is hitting the bottom of the bottle? It’s soft silicon tubing... if it was to sit on the bottom, it could theoretically suction on, and collapse, then at some point release and maybe create the air bubble?

Dawsokj1988 · Mar 16, 2018

Well I guess that's always a possibility. The bottles not clear so I have no real way of knowing. I thought this was an established issue with the reagent that was already identified and being worked on. I've considered getting a clear container for the liquid, though I didn't want to risk contamination

Mortie31 · Mar 16, 2018

Starting to get really frustrated now, I have posted several times in the months I’ve had my KHD, about Inconsistant readings, bubbles, waste pipe, pilot error etc, I can never get more than a week of consistant readings before i get bad readings, my last one rock steady at 7.4 for several days then drops to 6.4dkh, how can I trust it to automate dosing when I’m getting this happen? This is not my tank consuming this Alk it just doesn’t happen that quickly, strange thing is I’ve checked back and the bad readings are always downwards and usually about 1dkh, any answers chaps?

Support@GHLUSA · Mar 16, 2018

Mortie31 said:
Starting to get really frustrated now, I have posted several times in the months I’ve had my KHD, about Inconsistant readings, bubbles, waste pipe, pilot error etc, I can never get more than a week of consistant readings before i get bad readings, my last one rock steady at 7.4 for several days then drops to 6.4dkh, how can I trust it to automate dosing when I’m getting this happen? This is not my tank consuming this Alk it just doesn’t happen that quickly, strange thing is I’ve checked back and the bad readings are always downwards and usually about 1dkh, any answers chaps?

What changes?
What do you do to resolve the low readings and reset back to the higher readings?

Mortie31 · Mar 16, 2018

Marco@GHLUSA said:
What changes?
What do you do to resolve the low readings and reset back to the higher readings?

In most case simply running 3 -4 measurements back to back resolves the low readings

Support@GHLUSA · Mar 16, 2018

How many measurements are you scheduled to do per day?
How many mL is your sample size?

Mortie31 · Mar 16, 2018

Marco@GHLUSA said:
How many measurements are you scheduled to do per day?
How many mL is your sample size?

I’m running 100ml samples and 6 measurements per day

Mortie31 · Mar 16, 2018

Marco@GHLUSA said:
I’m wondering, is there any chance that your reagent suction line is hitting the bottom of the bottle? It’s soft silicon tubing... if it was to sit on the bottom, it could theoretically suction on, and collapse, then at some point release and maybe create the air bubble?

You can avoid any possibility of this by cutting the ends at 45deg rather than flat, I do this on all of my dosing lines

scuzy · Mar 16, 2018

I dumped all my reagents into a oxo glass container that is air tight drilled a hole and ran it and its been consistent now.

reefwiser · Mar 16, 2018

Looks good and you can see your level easy too.

Mortie31 · Mar 16, 2018

scuzy said:
I dumped all my reagents into a oxo glass container that is air tight drilled a hole and ran it and its been consistent now.

Good to hear your getting consistant results now, how long since you changed to the new glass container and do you have any thoughts as to why it has made a difference? Do you think that the plastic bottles could be reacting in any way and creating the bubbles so many of us are experiencing? I’ve tried heating the containers and tapping them to remove the bubbles as GHL suggested, I’m not even sure if it is bubbles in my case as surely if it was then you would see an increase in KH as the director would have to pump more reagent volume to get the reading? It may not work that way, but either way really fed up now..

scuzy · Mar 16, 2018

I'm not surei notice there is tons of air bubbles in the morning and but now i don't see it after the initial first day. I was also having sporadic readings when that line was longer than 20" now that it's shorten and gotten all the air out of the system I'm able to get more constant readings.

Mortie31 · Mar 16, 2018

scuzy said:
I'm not surei notice there is tons of air bubbles in the morning and but now i don't see it after the initial first day. I was also having sporadic readings when that line was longer than 20" now that it's shorten and gotten all the air out of the system I'm able to get more constant readings.

Can you let us no in a few more days how it goes please. I can get upto a week before I get a bad reading usually 4-5 days though and my tube length is 10” long, I’ve just ordered an oxo jar to try as I’m fast running out of options and patience.