GHL KHD

[Aaronreef]

Sample volume is 100ml

 

[paul01609]

Think I found was evey adjustment you make take a wile for the unit to settle

 

[paul01609]

What about the reagent is it ghl or diy acid

 

[Aaronreef]

Im going to set it back up on the tank and see what results I get this time.

I'm using GHL reagent

 

[Aaronreef]

Is the amount of sample water I'm using ok 100ml

 

[paul01609]

Is the amount of sample water I'm using ok 100ml

Mines set to 100ml,sample line is in a low flow part of sumpi have mine on a angle just below the water it’s held in place with a suction cup

 

[Aaronreef]

Just started again testing the tank will leave it over night and see what the outcome is.

Another question.
When the sample water is draw into the unit should the 'current ph-value' shown in the khd be the same as my tank pH

 

[paul01609]

Just started again testing the tank will leave it over night and see what the outcome is.

Another question.
When the sample water is draw into the unit should the 'current ph-value' shown in the khd be the same as my tank pH

Honestly not sure mate have you tested the ph calibration fluid to say that’s what the probe is reading

 

[Aaronreef]

Yes recalibrated the probe again today.
The 'current pH value' reads as it should when in a calibration fluid.

First test complete on the tank and is giving a read of what is expected inline with the Hanna checker

Will leave it over night to test and see the outcome tomorrow

Really appreciate all your help by the way

 

[paul01609]

Are your other parameters correct mag calcium?

 

[Aaronreef]

Yes everything is ok haven't tested mag for awhile but do regular 10% weekly water changes

35ppt
440 calcium
0.015 Phosphate
10 nitrate
9.5 alkalinity ( Hanna )
9.2 alkalinity KHD

 

[paul01609]

I would just leave it now for a couple of days,every time I adjust mine takes a few tests to settle again,when you got the low reading it could be possible it sucked up a air bubble

 

[Aaronreef]

I'll leave as Is for now.

If it does seem to be better then maybe it was air.
If that's the case what's the longest I can go with the water sample line?
I have to have the unit above the tank as I haven't got any space anywhere else

 

[paul01609]

I'll leave as Is for now.

If it does seem to be better then maybe it was air.
If that's the case what's the longest I can go with the water sample line?
I have to have the unit above the tank as I haven't got any space anywhere else

Honestly not sure on that maybe some one else could say,I would say it would be fine just recalibrate pumps and weight every thing again

 

[Aaronreef]

So far so good since yesterday, of it stay like this I'd be happy.

Thanks again @paul01609 for all the help

 

[paul01609]

So far so good since yesterday, of it stay like this I'd be happy.

Thanks again @paul01609 for all the help

Yea fingers crossed I find any adjustment on them they need a day to settle

 

[Aaronreef]

I'm inclined to think it had alot to do with the state of the doser heads as well
Will leave it where it is for now and give it a week to see

 

[wilsonline]

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.

I've got an answer from him on Youtube. I think he misunderstood one detail. CO2 will drop pH, yes, it will form some carbonic acid. But even though it's an acid, it will not drop your alkalinity. H2CO3 -> H + HCO3 so there's an equilibrium. for every H+ that comes out of carbonic acid and reacts with bicarbonate, you get another carbonic acid and another bicarbonate. you just switch H from one molecule to another. No change in alkalinity, but pH does drop.

 

[george7523]

I return the waste water back into the tank with no apparent adverse effect. but khd was a disappointment for me considering its price