I'm not sure if I'm doing this right - The Planted Tank Forum
 
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post #1 of 13 (permalink) Old 11-23-2005, 11:24 PM Thread Starter
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I'm not sure if I'm doing this right

I take 1/4 tsp of KNO3 and put it into a cup then mix it with water than pour it in the tank. I also do this with 1/16 of KH2PO4 and K2SO4. Am I dosing correctly?

I read Rex's guide but its way too confusing for me.
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post #2 of 13 (permalink) Old 11-24-2005, 12:35 AM
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We need more information. How many gallons are you dosing?

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post #3 of 13 (permalink) Old 11-24-2005, 12:48 AM
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Quote:
Originally Posted by trckrunrmike
I take 1/4 tsp of KNO3 and put it into a cup then mix it with water than pour it in the tank. I also do this with 1/16 of KH2PO4 and K2SO4. Am I dosing correctly?

I read Rex's guide but its way too confusing for me.

What part is confusing?
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post #4 of 13 (permalink) Old 11-24-2005, 01:49 AM
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It's the fruitcake.. its too much!!! HAHA now i'm hungry.
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post #5 of 13 (permalink) Old 11-24-2005, 02:20 AM Thread Starter
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I have a 20 gallon tank.

Rex, I'm not sure how many ppm I'm suppose to dose into the tank.
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post #6 of 13 (permalink) Old 11-24-2005, 03:25 AM
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Sounds good to me, trckrunrmike!

You can put all the chemicals in the cup at one time, or do the way you're doing right now. I notice if I just pour the water in, and leave the cup to dry, the residue will crystalize at the bottom of the cup, meaning not every bit of fertilizer actually made it into the tank.

Anyhow, I have a 20 gallon and XP1 just like you. Here's the routine that's been working well for me:

http://www.cise.ufl.edu/~alamoure/ot...ria/ferts.html
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post #7 of 13 (permalink) Old 11-24-2005, 04:01 AM
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http://www.csd.net/%7Ecgadd/aqua/art_plant_aquacalc.htm
download the calculator at the bottom of the page, input your tank volume, and go. Select adding dry ferts directly to tank, input amount of tsp you are adding and it will give you the ppm you will increase it by, along with a target of what it should be around. All tanks are different, so it is a good starting point.

BTW you are adding way too much to a 20gal tank. Do a BIG water change, wait a day do another waterchange, test the water and add ferts accordingly before you get major algae.


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post #8 of 13 (permalink) Old 11-24-2005, 01:08 PM
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Here third paragraph.
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post #9 of 13 (permalink) Old 11-24-2005, 04:14 PM
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Yes, dissolve in water then dump in tank.

I really recommend getting a balance (or scale) to measure. You could go the moderate to expensive route and get a brand new one from a lab supplier, or go the cheaper route and get one on ebay. I'd try to get a digital scale that measures in grams out to two decimal places (though it's not necessary).

Here's some numbers:


Increasing 1 gallon of water by 1 ppm of nitrate using KNO3:

Add 6.17237 mg of KNO3
** This will raise potassium by 0.63057 ppm

Example:

To add 10 ppm of nitrate to 25 gallons: 6.17237 mg * 10 ppm * 25 gallons = 1543.0925 mg / 1000 = 1.54 grams

** This raises potassium by 6 ppm



Increasing 1 gallon of water by 1 ppm of phosphate using KH2PO4:

Add 5.42416 mg of KH2PO4
** This will raise potassium by 0.41168 ppm

Example:

To add 1 ppm of phospate to 25 gallons: 5.42416 mg * 25 gallons = 135.604 mg / 1000 = 0.14 grams

** This raises potassium by less than 1 ppm



Increasing 1 gallon of water by 1 ppm of potassium using K2SO4:

Add 8.43575 mg of K2SO4

Example:

To add 20 ppm of potassium to 25 gallons: 8.43575 mg * 20 ppm * 25 gallons = 4217.875 mg / 1000 = 4.22 grams



Please note that while this looks ultra-precise, you should consider these figures as a starting point. You can test your water after dosing and see how "on the mark" you are, then adjust dosage accordingly. There's a LOT of things that can affect your actual test kit readings.




----- Calculations / Just Showing My Work -----


Potassium Nitrate:

K = 39.0983 g/mole

NO3 (Nitrate) = 62.00494 g/mole

KNO3 = 101.10324 g/mole

1 ppm in 1 liter of water:

1 ppm / (62.00494 g/mole / 101.10324 g/mole) = 1.63057 mg

1 ppm in 1 gallon of water:

1.63057 mg * 3.785412 liters/gallon = 6.17237 mg

Potassium:

1 ppm in 1 liter of water:

1 ppm / (39.0983 g/mole / 101.10324 g/mole) = 2.58587 mg

1.63057 mg / 2.58587 mg = 0.63057 ppm



Potassium Phosphate:

K = 39.0983 g/mole

PO4 (Phosphate) = 94.971361 g/mole

KH2PO4 = 136.085541 g/mole

1 ppm in 1 liter of water:

1 / (94.971361 / 136.085541) = 1.43291 mg

1 ppm in 1 gallon of water:

1.43291 mg * 3.785412 liters/gallon = 5.42416 mg

Potassium:

1 ppm in 1 liter of water:

1 / (39.0983 / 136.085541) = 3.48060 mg

1.43291 / 3.48060 = 0.41168 ppm



Potassium Sulfate:

K2 = 78.1966 g/mole

K2SO4 = 174.2602 g/mole

1 ppm in 1 liter of water:

1 / ( 78.1966 / 174.2602) = 2.22849 mg

1 ppm in 1 gallon of water:

2.22849 mg * 3.785412 liters/gallon = 8.43575 mg
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post #10 of 13 (permalink) Old 11-24-2005, 04:22 PM
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This is what i have been looking for, Thank you for doing the work and showing us how it's done. Definitely a bookmark.
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post #11 of 13 (permalink) Old 11-24-2005, 09:52 PM
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Look at the math major up there

I would agree with the digital scale idea, it is a life saver and you can just dump onto the tray, tare it add the next, and so on. Saves time and is a lot more accurate than the tsp route.


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post #12 of 13 (permalink) Old 11-25-2005, 01:14 AM
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Can someone please refer me to a good place to read about dosing? I need this in layman's terms b/c right now I am doing well to get basic testing done and I need to know what I need to be testing for on a regular basis. Thanks for your replies.
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post #13 of 13 (permalink) Old 11-25-2005, 03:29 AM
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Have you read my Guide?
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