EI dosing question - The Planted Tank Forum
 
LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 03-12-2014, 11:49 PM Thread Starter
Algae Grower
 
PTrader: (5/86%)
Join Date: Oct 2007
Location: Allentown, PA
Posts: 106
EI dosing question

Im looking into mixing up some dry ferts to start the EI method for fertilizing my 45 gallon tank. Im currently running high light and Co2. While using the online calculators on here I noticed that there is The Estimative Index option and the EI daily one. Does anyone know the difference between the two and which one should I follow? I just want to make sure its the right mixture for the 500l bottle.
Jerry23 is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 03-13-2014, 12:38 AM
Wannabe Guru
 
Higher Thinking's Avatar
 
PTrader: (23/100%)
Join Date: Mar 2011
Location: Oregon State Beavers!
Posts: 1,533
I don't know which calculator you are using, but the math is pretty simple if you know how much you want to dose each week. Looking at the size of tank you have, your weekly dosing would be
+/- 1/2 tsp KN03 3x a week
+/- 1/8 tsp KH2P04 3x a week
+/- 1/8 tsp Trace Elements 3x a week

Decide how much ferts you are going to add to your 500ml bottle. E.g. if you add 3 tsp of KNO3 your solution will provide 6 servings (two weeks) of nitrates. It's up to you how dense you want to make your solutions. Personally, unless you are using an autodoser (like a peristaltic pump) I don't think you should worry about mixing ferts up. Just add them to your tank and call it good.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Higher Thinking is online now  
post #3 of 6 (permalink) Old 03-13-2014, 01:48 AM Thread Starter
Algae Grower
 
PTrader: (5/86%)
Join Date: Oct 2007
Location: Allentown, PA
Posts: 106
Thanks for the info. I used this one http://calc.petalphile.com/ and got confused on different methods of how much to add for the mixture. Do I still need to worry about using the K2SO4? I currently use the seachem equilibrium to mix in my RO water for the GH.
Jerry23 is offline  
 
post #4 of 6 (permalink) Old 03-13-2014, 12:20 PM
Algae Grower
 
PTrader: (0/0%)
Join Date: Jul 2013
Location: Texas
Posts: 18
Quote:
Originally Posted by Jerry23 View Post
Thanks for the info. I used this one http://calc.petalphile.com/ and got confused on different methods of how much to add for the mixture. Do I still need to worry about using the K2SO4? I currently use the seachem equilibrium to mix in my RO water for the GH.

I use that calculator too and dose EI daily. What I like to do is look at it from the view of how much of each fert do you want to dose in ppm over the whole week. To do this just multiply the daily dose by 7 or the EI dose by 3. You still enter the aquarium volume, however the ppm being dosed is always the same regardless of volume, only the amounts of ferts used changes in the calculator.

By playing with the calculator you can see that when you compare the 'EI Daily' method with the 'Estimative Index' method that the weekly values of ppm ferts are identical (based on 3x a week using EI). Once you figure out how much you like to dose for your setup I like to use the 'What Dose to Reach Target' method.

I believe Tom Barr's max recommended total weekly dosing for a high light, CO2 injected, heavily planted tank is about 30 ppm KNO3, 10 ppm KH2PO4, and 1.4 Traces (or CSM+B). Again this is how much you are dosing and not the values in the aquarium at the end of the week. My water is moderately hard so I do not dose K2SO4.
LetsGoFishin is offline  
post #5 of 6 (permalink) Old 03-13-2014, 12:30 PM
Planted Tank Obsessed
 
chocological's Avatar
 
PTrader: (6/100%)
Join Date: Nov 2012
Location: NYC
Posts: 357
Equilibrium provides potassium, no? If it provides enough for you, then you wouldn't need to dose K2SO4.
But honestly if you're using RO water, why not just dry dose the GH booster mix which will take care of both the GH and potassium?


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


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


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Eheim 2217, pressurized C02, high tech planted

chocological is offline  
post #6 of 6 (permalink) Old 03-13-2014, 01:44 PM
Planted Tank Guru
 
Zorfox's Avatar
 
PTrader: (5/100%)
Join Date: Jun 2012
Location: Gainesville, FL
Posts: 2,105
"The Estimative Index" selection is for classic EI dosing which is macros and micros on alternating days i.e...

Mon Macros
Tues Micros
Wed Macros
Thurs Micros
Fri Macros
Sat Micros
Sun 50% water change (no dosing except for GH alterations)

Typical macros and micros are...
Macros = KNO3 & KH2PO4
Micros = Plantex CSM + B


EI Daily is simply dosing everyday

There's generally enough potassium (K) in the KNO3 and KH2PO4. If you crunch the numbers,
A Full EI dose of K is 7.5ppm.
KNO3 & KH2PO4 adds 5.27ppm
This leaves a deficit of only 2.23ppm of K.

That's a weekly deficit (if you want full EI dose) of 6.69ppm of K.

One teaspoon of Seachem Equilibrium provides 6.10 ppm of K which would account for the extra K needed. I would assume you are adding more than this to reconstitute your R/O anyway. Make sense?
Zorfox 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