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05-09-2014, 07:58 PM   #16
Bryanmc1988
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Join Date: Apr 2012
Location: San Diego - CA
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ok so i would like to know if i am doing this right or not here as it looks really weird to me

so from following this

Quote:
 the easiest way to do a premixed fertilizer is to first decide how much liquid I want to dose at a time. That could be a syringe full, a cap full, or something like that. For example, in my case I wanted to dose 1 ounce per dose. Next, based on the size of the bottle, figure out how many of those doses are in the bottle. In my case it is a 16 oz bottle, so I have 16 doses in the full bottle. Next I calculate how many tsp of KH2PO4 I need per dose (for example). If it is 1/8 tsp, I multiply that by 16, and that is how much KH2PO4 I put in the bottle with 16 ounces of water. Now, my one ounce dose will contain the right amount of fert for one dose.

if i used a 500 ml pump bottle which each pump is 2ml... so i want to do a pump for each dosing which comes out to about "250" dose per 500ml bottle right? ok so to get each pump to the right amount of ferts say its 1/4 teaspoon per dosing which is 0.25 times that by 250 dose which would equal to "1/4 teaspoon" per pump, and by timing the 0.25 by 250 dose that i can get per 500ml bottle will equal to "62.5 teaspoons" of ferts for a 500ml bottle? is this right cause thats a lot of Fertz ....

 05-09-2014, 08:23 PM #17 Zorfox Wannabe Guru     PTrader: (5/100%) Join Date: Jun 2012 Location: Gainesville, FL Posts: 1,727 You are doing the math correctly. However, 1/4 teaspoon per 10 gallons is a very large dose. So that high dose "snowballs" when you multiply it times 250. That's one reason to use solutions for smaller tanks such as 10 gallons. Teaspoon measures are prone to error. If you want 2ml per dose (2ml per 10 gallons) and a 500ml container the amounts are listed below. KNO3 22 1/4 teaspoons KH2PO4 3 1/8 teaspoons Plantex 16 3/4 teaspoons
 05-09-2014, 08:27 PM #18 Bryanmc1988 Wannabe Guru   PTrader: (43/100%) Join Date: Apr 2012 Location: San Diego - CA Posts: 1,011 well i was doing the math for a 35 gallon of water tank not for the 10gallon tank so confused on how to use the fert calculator now... is there a step by step instructions on how to use it correctly? i'm not sure if i am using it correctly or how you came up with these Teaspoon amount to mix with the water
 05-09-2014, 08:41 PM #19 Zorfox Wannabe Guru     PTrader: (5/100%) Join Date: Jun 2012 Location: Gainesville, FL Posts: 1,727 Calculate for a 10 gallon tank using the Estimative index dosing method. Select solution instead of dry dosing. Enter 500ml for the container size and 2ml for the dose. Select the fertilizer you want to use and click calculate. This will give you a normal EI dose for a 10 gallon tank. To dose a 20 gallon use 2 doses, 30 gallons use three etc. I know it can be confusing at first but it will become quite boring after awhile.
05-10-2014, 01:04 AM   #20
Bryanmc1988
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Join Date: Apr 2012
Location: San Diego - CA
Posts: 1,011

another thing i am confused about is this here... i will explain what i did and what doesnt match up...

so i did this in my version below for a 500ml in 5 ml per dose

Quote:
 the easiest way to do a premixed fertilizer is to first decide how much liquid I want to dose at a time. That could be a syringe full, a cap full, or something like that. For example, in my case I wanted to dose 1 ounce per dose. Next, based on the size of the bottle, figure out how many of those doses are in the bottle. In my case it is a 16 oz bottle, so I have 16 doses in the full bottle. Next I calculate how many tsp of KH2PO4 I need per dose (for example). If it is 1/8 tsp, I multiply that by 16, and that is how much KH2PO4 I put in the bottle with 16 ounces of water. Now, my one ounce dose will contain the right amount of fert for one dose.
500ml bottle at 5ml per dose = to 100 dose possible
fertz is 1/4 Tsp-KN03
so i times 0.25 x 100(dose per bottle) = 25teaspoons of ferts per 500ml of water

but when i used the program it says i needed 31-1/8 teaspoons of KNO3

am i doing something wrong here?

 05-10-2014, 05:16 AM #21 jrman83 Wannabe Guru   PTrader: (12/100%) Join Date: Nov 2010 Location: White Plains, MD Posts: 1,000 I don't see how measuring a liquid amount is any easier than measuring a dry powder that you scoop out and drop in. No calculations required. I have 4 tanks that I dose and 3 are 75g or bigger and hi-tech. Takes about 2min tops. To each their own I guess. How the simplest things can be made difficult amazes me sometimes. Sent with my Samsung S4 via Tapatalk __________________ Eheim Pimp #448
 05-10-2014, 05:23 AM #22 Bryanmc1988 Wannabe Guru   PTrader: (43/100%) Join Date: Apr 2012 Location: San Diego - CA Posts: 1,011 lol you can scoop out and dump in with is easy or make a mix solution and pump in what u need for 3 tanks xD it seems to me like if i did my kno3 that 1 lb will last me about 7 months which is not bad... for doesing 3 tanks 3 times a week
05-10-2014, 05:29 AM   #23
jrman83
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Join Date: Nov 2010
Location: White Plains, MD
Posts: 1,000

Quote:
 Originally Posted by Bryanmc1988 lol you can scoop out and dump in with is easy or make a mix solution and pump in what u need for 3 tanks xD
My point exactly but with no mixing bottles to buy or the headache you are going through just to "start". I started out your way without calculation problems and after 4yrs and many pounds of ferts later I settled on the method with less headache. Like I said, to each their own.

Sent with my Samsung S4 via Tapatalk
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 05-10-2014, 06:41 AM #24 Bryanmc1988 Wannabe Guru   PTrader: (43/100%) Join Date: Apr 2012 Location: San Diego - CA Posts: 1,011 How fast do they desolved if dose dry or do they sit on the bottom of the tank?
05-10-2014, 10:42 AM   #25
greaser84
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Join Date: Feb 2014
Location: NC
Posts: 1,401

Quote:
 Originally Posted by Bryanmc1988 How fast do they desolved if dose dry or do they sit on the bottom of the tank?
Most of the dry ferts make it to the bottom before they dissolve, but they dissolve pretty quickly once on the bottom, in my tanks they are fully dissolved in under 10mins. As long as you have good flow they will get distributed throughout the tank. I find it sooooo much easier to dose dry ferts straight to the tank. I went on ebay and bought "mini measuring spoons", they are perfect for small tanks.

Last edited by greaser84; 05-10-2014 at 10:45 AM.. Reason: forgot

 05-10-2014, 12:00 PM #26 jrman83 Wannabe Guru   PTrader: (12/100%) Join Date: Nov 2010 Location: White Plains, MD Posts: 1,000 I release mine directly in the flow of power heads and don't see them anymore in under a minute. Sent with my Samsung S4 via Tapatalk __________________ Eheim Pimp #448
 05-10-2014, 01:53 PM #27 Bryanmc1988 Wannabe Guru   PTrader: (43/100%) Join Date: Apr 2012 Location: San Diego - CA Posts: 1,011 well flow is not an issue for me as you can only imagin a fluval fx5 on a 40B lol its like a tornado in there xD
05-10-2014, 01:58 PM   #28
Zorfox
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Join Date: Jun 2012
Location: Gainesville, FL
Posts: 1,727

Quote:
 Originally Posted by Bryanmc1988 but when i used the program it says i needed 31-1/8 teaspoons of KNO3 am i doing something wrong here?
There is that cumulative effect again. 1/4 tsp. (1,300mg) of KNO3 will raise NO3 to 6.02ppm. The target is 7.5ppm so there is 1.48ppm difference for each dose. The difference for a calculator is 319.7226mg per dose. Multiply that times 100 and the difference is 31972mg. Since KNO3 averages 5,200mg per teaspoon that's a difference of 6 1/8 teaspoons which is why the calculator reports a different value.

 05-10-2014, 02:12 PM #29 Bryanmc1988 Wannabe Guru   PTrader: (43/100%) Join Date: Apr 2012 Location: San Diego - CA Posts: 1,011 so what is more accurate? the program i assume ? also how much iron 10% should i mix into a 500 ml with CSM+B?
05-10-2014, 03:03 PM   #30
Zorfox
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Join Date: Jun 2012
Location: Gainesville, FL
Posts: 1,727

Quote:
 Originally Posted by Bryanmc1988 so what is more accurate? the program i assume ? also how much iron 10% should i mix into a 500 ml with CSM+B?
Yes, the calculator is more accurate. However, both doses you listed will work well. There is no need to be overly accurate.

A 2:1 ratio seems about right. Two parts Plantex and one part DTPA. Just calculate for a total iron of 0.5ppm per dose. So that would be 0.333ppm of iron via Plantex and 0.17ppm of iron via DTPA.

So in a 500ml container 2ml per 10 gallons that's

11 1/4 teaspoons of Plantex
3 3/4 teaspoons of DTPA 10%

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