Go Back   Aquarium Advice - Aquarium Forum Community > Freshwater > Freshwater & Brackish - Planted Tanks
Click Here to Login

Join Aquarium Advice Today
Reply
 
Thread Tools Search this Thread Display Modes
Please support our sponsors and let them know you heard about them on AquariumAdvice.com
 
Old 05-03-2007, 03:58 AM   #1
Aquarium Advice Apprentice
 
Join Date: Nov 2003
Location: Waterloo, ON
Posts: 29
Drop Checker Accuracy vs Kh/PH method

Hello, I was wondering if anyone has noticed a difference in reading co2 from the level indicated by a drop checker, and comparing that with a measurement using the Kh/Ph method.

After reading some threads, I want to get a drop checker. Also, my LFS (big als) sells the Red Sea CO2 Indicator. This is a drop checker? And I was wondering if anyone knows at what level is it calibrated to indicate a good co2 level? Also can I change the reference solution in it and use the method given in the sticky?

So if anyone can answer those questions I would appreciate it
__________________

__________________
Kramer is offline   Reply With Quote
Old 05-03-2007, 04:21 AM   #2
Aquarium Advice Addict
 
rkilling1's Avatar
 
Join Date: Dec 2005
Location: NE ohio
Posts: 2,245
Send a message via AIM to rkilling1
Re: Drop Checker Accuracy vs Kh/PH method

Quote:
Originally Posted by Kramer
After reading some threads, I want to get a drop checker. Also, my LFS (big als) sells the Red Sea CO2 Indicator. This is a drop checker? And I was wondering if anyone knows at what level is it calibrated to indicate a good co2 level? Also can I change the reference solution in it and use the method given in the sticky?
I use the Red Sea one and don't have any problems with it.

You can get certified KH standards here:

http://liquidarthome.net/khstandard



I ran a KH test on the KH standard and it showed up as 4 just as it should have, but I have never checked the difference between pH/KH and the drop checker.

Even if my aquarium didn't have anything that would distort the results, you need a more accurate test kit to be able to measure CO2 effectively. ie having a KH of 4 in your tank means it's between 3 and 5. It doesn't mean it is exactly 4.

Lets just say my pH kit is 100% accurate, if I use the pH/KH charts and knowing that my KH is between 3 and 5 I would end up with:

A CO2 of 22.6 is I use a KH of 3 and a CO2 of 37.7 is my KH was 5.

That's a 15 PPM difference. Quite a margin of error. If I were to take out the KH error, my error margin decreases dramatically. This is the main reason for using a drop checker and a certified standard. I know, within a small percentage of error, what my CO2 really is.

There is no reason for me to check the KH/pH vs drop checker due to the wide band of the KH test kit. (Granted you are still using the KH/pH chart with the drop checker)
__________________

__________________
My Planted Aquariums
rkilling1 is offline   Reply With Quote
Old 05-03-2007, 10:59 AM   #3
Moderator Emeritus
 
Purrbox's Avatar
 
Join Date: Jun 2005
Location: Iowa USA
Posts: 5,860
The greater level of accuracy is acheived when you use a KH reference solution with a drop checker. Most commercial drop checkers, like the one by Red Sea, recommend that you use tank water in them. This is no more accurate than testing your water. It's when you have known KH value without any buffers affecting the pH/KH relationship that the accuracy is improved. The other benefit is that you can determine you levels with a quick glance instead of having to drag out your test kits.
Purrbox is offline   Reply With Quote
Old 05-03-2007, 01:39 PM   #4
Aquarium Advice Apprentice
 
Join Date: Nov 2003
Location: Waterloo, ON
Posts: 29
egads, a margin of error 15ppm? 8O I wondered about my Kh test accuracy.

So ill need to get a different Kh reference solution for this red sea.. alright sounds like a fun project! unless the lfs sells it, i dont want to buy it off the net i want it NOW! lol

Thank you for the advice!.
__________________
Kramer is offline   Reply With Quote
Reply

Tags
checker, drop, method

Please support our sponsors and let them know you heard about them on AquariumAdvice.com

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
PH/KH vs Drop Checker ricardo48 Freshwater & Brackish - Planted Tanks 4 10-31-2009 11:50 AM
Drop checker misleading ricardo48 Freshwater & Brackish - Planted Tanks 9 09-07-2009 05:44 PM
Co2 Drop Checker ricardo48 Freshwater & Brackish - Planted Tanks 7 08-11-2009 05:22 AM
A few questions about drop checker SWerner13 Freshwater & Brackish - Planted Tanks 7 04-07-2009 08:07 PM
Drop checker cbwmn Freshwater & Brackish - Planted Tanks 3 02-01-2009 10:31 PM







» Photo Contest Winners







All times are GMT -4. The time now is 06:01 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.