Fertilator - Measurement / unit question - The Planted Tank Forum
Old 02-09-2014, 08:49 PM Thread Starter
Algae Grower

Join Date: Jun 2011
Location: New York City
Posts: 116
Fertilator - Measurement / unit question

I discovered Fertilator the other day, but I have a question about the answer it gives.

If I enter 7grams of KNO3 for my 55g tank, it says my PPM change will be +20.62ppm N03.

But is that 7 grams 3xtimes a week [EI method] = 21 grams will add +20ppm NO3
OR
7 grams total will add +20ppm NO3

Thanks!
Justin
Justinkscott is offline

Old 02-09-2014, 09:39 PM
Planted Tank Guru

Join Date: Jun 2012
Location: Gainesville, FL
Posts: 2,105
That 7 grams would be a full weeks dose. You can divide that by three. Each full EI dose should be around 7.5ppm which is 2.5grams.

I would suggest this calculator instead. Just choose The Estimative index selection for each fertilizer. This calculator has far more functionality.
Zorfox is offline
Old 02-09-2014, 11:31 PM Thread Starter
Algae Grower

Join Date: Jun 2011
Location: New York City
Posts: 116
thanks!

Actually, although I really like the concentration of stuff vs time part.... it seems to be missing a key feature that is found in fertilator.

Fertilator takes in to account the interaction of potassium (K) when using KNO3, KH2PO4, and K2S04. Using the Yet Another calculator (EI), the K levels added per week are 38.29ppm. Assuming EI method's weekly water change of 50%, that sends the potassium levels to over 75ppm after only 1 month. 75ppm is found in nature, my research suggests that 20-30ppm is optimal.

Am I missing something?

Here's what I did:
I chose the following settings in YANCalc:
55g
diy
KNO3
dry dosing
The Estimative Index
-- Multiply by 3 (for 3x per week), record value into fertilator.
Repeat for KH2PO4 and K2S04

Fertilator spit out:
22.5 NO3 ppm
3.89PO4 ppm
38.29 K ppm

Then I took that number and put it back in to YANCalc's Concentration vs time calc... and I got:
Attached Thumbnails

Last edited by Darkblade48; 02-10-2014 at 05:49 AM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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