GHL KHD

[Aaronreef]

Is it ok to return the waste water and vent back to the tank ?

 

[vangvace]

Many do it without issue. The vent line you will want an air gap between the tank water and the line.

 

[1Bigfish]

Is it ok to return the waste water and vent back to the tank ?

Following...I just ordered a KHD and am wondering what the effect would be of waste water on the tank as well

 

[Aaronreef]

Thanks,

I'm also having issues with “Titration takes too long”

I brought the unit second hand, and the previous owner hasn't used it for 2+ months they have left the pH probe inside the khd I'm wandering if the probe is faulty?

Ive calibrated the probe today with 4 and 7 and I'm now getting a reading of 2.67 "current pH value" is that normal ?
I've flushed the measurement cell and fried to retest but still getting the error message
Any help would be appreciated


@Vinny@GHLUSA

 

[Aaronreef]

Following...I just ordered a KHD and am wondering what the effect would be of waste water on the tank as well

Im going to be returning it to the tank as I'm currently putting waste into a container and it fills up pretty quickly

 

[Aaronreef]

May of found the issue. the waste and vent line was both in a bottle with a screw cap, the cap was tight causing pressure in the bottle
I'm now getting a dkh reading.

Can I set it to take readings at night only ?

 

[Aaronreef]

Sorry for More questions.

Is the unit meant to be loud?
It's only the waste/vent tube that does it,
it vibrates/judders when in use and makes a fair bit of noise

 

[Ardeus]

I don't have a KHD but I have a Xepta Autobalance that uses the same kind of reagent.

I have been returning the water back to the tank until recently. I looked at an empty 1 gallon jug of reagent and I realised that over the last months I had dumped that amount of acid into the tank.

Xepta says it's safe, that the only thing it will do is lower your alkalinity and the Autobalance will obviously replenish that.

But when the Xepta doses to compensate, it doses not only the alk component of the balling but also the other 2 parts. Over time this will create an imbalance.

 

[Aaronreef]

I have tested every hour through the night and have had a drop in alk. it's the first time I've done this so not sure if it's correct, I assumed alk at night wouldn't drop as less uptake? I am returning the waste back to the tank as it takes a fair amount of water out. Maybe the drop is due to the acid being returned like you say?

 

[Ardeus]

Not all alk drops are caused by coral consumption. Low pH apparently binds carbonates to the rock. To what extent? I don't know.

I remember seeing Chris Meckley saying this and it seems counterintuitive. After all shouldn't low pH dissolve coral skeletons?

But he was saying that thing binding happens at high 7's.

He was saying that when you manage to raise the pH of your tank to 8.3 and above, the carbonates that were bound to the rock and sand are released.

 

[Aaronreef]

I keep a pH of 8-8.3, so any bound carbonate would be released ? Causing an increase not a decrease?

 

[Ardeus]

Yes.

Chris was saying that when you have low ph for a long time and then you manage to raise it, you get an alk spike due to the release of carbonates from the rock and sand.

Do you know what happened to your pH during the alk drop?

 

[paul01609]

Is it ok to return the waste water and vent back to the tank ?

I return my waste back in to the sump never been a problem

 

[paul01609]

Sorry for More questions.

Is the unit meant to be loud?
It's only the waste/vent tube that does it,
it vibrates/judders when in use and makes a fair bit of noise

It could be the machine vibrating when it mixes

 

[Aaronreef]

It could be the machine vibrating when it mixes

Is that normal? It's very noticeable.
I've looked for videos of it but nobody seems to show it

 

[paul01609]

When yours it mixing reagent with sample water is the machine touching anything that will amplify the vibrating?

 

[paul01609]

I do get squeaking sound from the pumps tho

 

[Aaronreef]

When yours it mixing reagent with sample water is the machine touching anything that will amplify the vibrating?

I've had it in a few different locations while setting it up and it does it no matter where it's placed.
I can see the water sample line vibrating

 

[Aaronreef]

I'm getting very inconsistent reading's
Can I use the pH probe from the profilux P4 to test of the probe is at fault?

 

[paul01609]

I'm getting very inconsistent reading's
Can I use the pH probe from the profilux P4 to test of the probe is at fault?

how Long has it been up and running?
I advise you not to use there tube calculation and measure every by weight with some scales