Drop Checker - The Planted Tank Forum
 
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 10-04-2011, 01:19 AM Thread Starter
Algae Grower
 
PTrader: (0/0%)
Join Date: Sep 2011
Location: Alabama
Posts: 14
Drop Checker

When I searching about a drop checker .I can't find much info .Can some one explain how this devise works .I understand there is a agent poured in a tube ,and its put in the tank .Does the agent change colors ? How long will the agent last ?Can someone explain.
MDunn is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 10-04-2011, 02:04 AM
Wannabe Guru
 
PTrader: (1/100%)
Join Date: Apr 2011
Location: Westfield, IN
Posts: 1,746
The way it works is by CO2's effect on the pH of a standard solution, which is viewed using an indicator. When CO2 dissolves in water, it forms carbonic acid, lowering the pH. If you start with a particular solution (4 dKH solution) that is buffered to a specific pH, the small changes in pH that dissolved CO2 creates cause fairly large changes in the color of an indicator (bromthymol blue, the blue/yellow indicator commonly sold in pH test kits.) The drop checker is set up so that CO2 in the solution and the CO2 in the aquarium are related, even though the water doesn't mix between them.

Heres a crappy drawing.

Click image for larger version

Name:	drop checker.jpg
Views:	42
Size:	38.7 KB
ID:	35617

As the amount of CO2 in the tank increases or decreases, the amount going from the tank to the checker increases or decreases, which causes the color of the checker to change. You're generally shooting for a lime green checker, if everything is set up right and you're using the standard solutions. These work well, with the caution that they are fairly slow to respond to change. A shift in CO2 concentration in the tank takes time to translate into a shift in CO2 concentration in the checker because of the roundabout path it must take to get there.

Hope this helps.
jasonpatterson is offline  
post #3 of 5 (permalink) Old 10-04-2011, 02:09 AM Thread Starter
Algae Grower
 
PTrader: (0/0%)
Join Date: Sep 2011
Location: Alabama
Posts: 14
Thank U
MDunn is offline  
 
post #4 of 5 (permalink) Old 10-04-2011, 02:20 AM
Wannabe Guru
 
PTrader: (16/100%)
Join Date: Aug 2011
Location: New York City.
Posts: 1,974
Also, don't bother with getting a drop checker with the indicator solution. Just get the "container" if you can. You can use the API pH test kit solution too. Regardless, you need to order a 4dkh solution to make the testing accurate. Unless it is stated, most drop checkers do not include the 4dkh solution. I got mine from Ebay though after I bought a drop checker with its own indicator solution. For some reasons, it turns yellow first with the included indicator solution. I use the solution from my Tetra pH test kit instead.
tetra73 is offline  
post #5 of 5 (permalink) Old 10-04-2011, 02:49 AM
Wannabe Guru
 
PTrader: (1/100%)
Join Date: Apr 2011
Location: Westfield, IN
Posts: 1,746
You can get the checker and solution fairly cheaply on the swap and shop here. Can't remember who it is, but there's always at least one person selling them. The price is very reasonable.
jasonpatterson 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