Drop Checker vs Ph Drop - The Planted Tank Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 49 (permalink) Old 02-17-2014, 11:07 PM Thread Starter
Planted Tank Enthusiast
 
jmrmotorhead's Avatar
 
PTrader: (49/100%)
Join Date: Sep 2011
Location: Colorado
Posts: 664
Drop Checker vs Ph Drop

Hi all-

Has anyone had a drop checker yellow, but only gotten a .4-.5 Ph drop? My plants are doing great, pearling and nearly no algae, but why such a low ph drop? Fish are all acting fine as well.

Any thoughts?

Matt


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

40B High Tech Tank - 10g Shrimp and Moss Tank
jmrmotorhead is offline  
Sponsored Links
Advertisement
 
post #2 of 49 (permalink) Old 02-18-2014, 12:44 AM
Wannabe Guru
 
PTrader: (16/100%)
Join Date: Aug 2011
Location: New York City.
Posts: 1,974
It depends on your KH reading. Most people use the tank water KH reading. If your KH is high (ie 10), a .5 ph drop would give you 30ppm of CO2 the most.


Canon Pimp Club #005
tetra73 is offline  
post #3 of 49 (permalink) Old 02-18-2014, 02:05 AM Thread Starter
Planted Tank Enthusiast
 
jmrmotorhead's Avatar
 
PTrader: (49/100%)
Join Date: Sep 2011
Location: Colorado
Posts: 664
Not sure if that makes sense. A full point of ph drop generally equates to 30ppm give or take, assuming the off gassed water was at ~3ppm co2. Doesn't seem to be dependent on kh, simple if kh is higher, the ph will be higher at 3, as well as at 30ppm. Just moves te scale but they stay 1.0 apart. Correct?


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

40B High Tech Tank - 10g Shrimp and Moss Tank
jmrmotorhead is offline  
 
post #4 of 49 (permalink) Old 02-18-2014, 02:11 AM
Wannabe Guru
 
ipkiss's Avatar
 
PTrader: (4/100%)
Join Date: Aug 2011
Location: FL
Posts: 1,284
I think the other thing that is more suspect is your 4dKH solution. If it's less than 4, it can prematurely give you yellow and if it's more than 4, you might never get the green you're looking for.

https://www.plantedtank.net/forums/sh...ad.php?t=86701
ipkiss is offline  
post #5 of 49 (permalink) Old 02-18-2014, 02:16 AM Thread Starter
Planted Tank Enthusiast
 
jmrmotorhead's Avatar
 
PTrader: (49/100%)
Join Date: Sep 2011
Location: Colorado
Posts: 664
That's my thought too, the solution I have came pre mixed with reagent from the member that I bought my drop checker from. No clue where he got it.

Matt

And thanks for the link- good read.

Matt


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

40B High Tech Tank - 10g Shrimp and Moss Tank

Last edited by Darkblade48; 02-18-2014 at 03:46 AM. Reason: Back to back posts
jmrmotorhead is offline  
post #6 of 49 (permalink) Old 02-18-2014, 02:28 AM
Wannabe Guru
 
ipkiss's Avatar
 
PTrader: (4/100%)
Join Date: Aug 2011
Location: FL
Posts: 1,284
odd.. usually if it's a well known seller on these forums, the solution should be correct. Do you have a kh test kit to verify it?

I guess you could always make your own
without a scale
https://www.plantedtank.net/forums/sh...8&postcount=14
with a scale
https://www.plantedtank.net/forums/sh...php?t=107303#6
ipkiss is offline  
post #7 of 49 (permalink) Old 02-18-2014, 02:32 AM Thread Starter
Planted Tank Enthusiast
 
jmrmotorhead's Avatar
 
PTrader: (49/100%)
Join Date: Sep 2011
Location: Colorado
Posts: 664
Honestly I don't think it was a very well known member. He was gettin out of planted tanks, had the whole setup on craigslist, I picked up his whole co2 setup. Good deal, but I'm suspect of the solution.

I do not have a test kit, but do have a scale. Maybe I'll whip some up


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

40B High Tech Tank - 10g Shrimp and Moss Tank
jmrmotorhead is offline  
post #8 of 49 (permalink) Old 02-18-2014, 02:58 AM
Wannabe Guru
 
PTrader: (16/100%)
Join Date: Aug 2011
Location: New York City.
Posts: 1,974
Quote:
Originally Posted by jmrmotorhead View Post
Not sure if that makes sense. A full point of ph drop generally equates to 30ppm give or take, assuming the off gassed water was at ~3ppm co2. Doesn't seem to be dependent on kh, simple if kh is higher, the ph will be higher at 3, as well as at 30ppm. Just moves te scale but they stay 1.0 apart. Correct?

The present of CO2 will cause the PH to drop regardless of your KH level. However, how far the ph will drop would indicate how much CO2 level you have. See the chart for yourself....

http://www.barrreport.com/showthread...O2-pH-KH-table


Canon Pimp Club #005
tetra73 is offline  
post #9 of 49 (permalink) Old 02-18-2014, 03:01 AM
Children Boogie
 
mistergreen's Avatar
 
PTrader: (13/100%)
Join Date: Dec 2006
Location: Cincinnati
Posts: 16,743
You shouldn't trust pH levels in your tank to indicate CO2 levels. Many things influence pH in the tank. That's why we have drop checkers with a controlled liquid.
mistergreen is offline  
post #10 of 49 (permalink) Old 02-18-2014, 03:13 AM Thread Starter
Planted Tank Enthusiast
 
jmrmotorhead's Avatar
 
PTrader: (49/100%)
Join Date: Sep 2011
Location: Colorado
Posts: 664
Quote:
Originally Posted by tetra73 View Post
The present of CO2 will cause the PH to drop regardless of your KH level. However, how far the ph will drop would indicate how much CO2 level you have. See the chart for yourself....

http://www.barrreport.com/showthread...O2-pH-KH-table
Yes- I'm looking at the chart. But from 3ppm to 30 is one point of ph, no matter if your kh is 20, or 1. I set up my oh controller to drop .4 as of now, because the drop check is yellow, therefore according to the chart, I have 7.6 ppm, no matter where on the chart my kh falls. Of course again this depends on if my off gassed glass of water that I compare to actually has 3ppm co2 in it.

Mister- that is true, was just wondering if anyone has seen this anomaly before. I'm sure they have though. I just find it odd that the same water after offgassing isn't a point higher, and the dc is yellow. Or my eyes are bad!

Matt


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

40B High Tech Tank - 10g Shrimp and Moss Tank
jmrmotorhead is offline  
post #11 of 49 (permalink) Old 02-18-2014, 03:31 AM
Children Boogie
 
mistergreen's Avatar
 
PTrader: (13/100%)
Join Date: Dec 2006
Location: Cincinnati
Posts: 16,743
CO2 gas is trapped in the drop checker. It takes a while maybe 30-40 mins for it to be in equilibrium with the tank's CO2 level.
mistergreen is offline  
post #12 of 49 (permalink) Old 02-18-2014, 03:58 AM Thread Starter
Planted Tank Enthusiast
 
jmrmotorhead's Avatar
 
PTrader: (49/100%)
Join Date: Sep 2011
Location: Colorado
Posts: 664
True, but with the ph controller holding it at 6.8 (.4 drop) shouldn't the drop checker have caught up by now? The levels should not be changing much since the controller holds it


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

40B High Tech Tank - 10g Shrimp and Moss Tank
jmrmotorhead is offline  
post #13 of 49 (permalink) Old 02-18-2014, 04:14 AM
Wannabe Guru
 
ipkiss's Avatar
 
PTrader: (4/100%)
Join Date: Aug 2011
Location: FL
Posts: 1,284
oh! mistergreen sparked up another possible cause.. do you use a diffuser and have many tiny co2 bubbles trapped in the drop checker? If so, then it may be giving you a false yellow too.
ipkiss is offline  
post #14 of 49 (permalink) Old 02-18-2014, 01:40 PM Thread Starter
Planted Tank Enthusiast
 
jmrmotorhead's Avatar
 
PTrader: (49/100%)
Join Date: Sep 2011
Location: Colorado
Posts: 664
Great thought, I have a reactor, but there are tiny bubbles that spit out occasionally. The tank is full of bubbles from plants pearling, so it's hard to tell what's co2. Hmm

Out of curiosity, do co2 bubbles affect the reading of a ph probe at all?

Matt


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

40B High Tech Tank - 10g Shrimp and Moss Tank
jmrmotorhead is offline  
post #15 of 49 (permalink) Old 02-18-2014, 03:01 PM
Planted Tank Obsessed
 
PTrader: (0/0%)
Join Date: Feb 2010
Location: Woodstock, IL
Posts: 354
Did you do a 2 point calibration on the controller?

The controller could be giving a false reading. How old is your probe?
dmagerl is offline  
Reply

Tags
None

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome