Approximate PPM per dose?

longhornxtreme

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Hi all,

I was wondering if anyone could tell me what the approximate PPM added to the tank for N,P,K for each dose (3x a week)? I'm wanting to mix up my own solutions to work with and I can do the rest of the math myself, but I don't know how many Grams are in each teaspoon measurement.

Thanks in advance
 

Tom Barr

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All dosing calculators have them built in.
So you can use those.

You can also use a density of the substance and that the 1/4 teaspoon = 5mls or 5 cc's.

Per week:
I generally add about 20-30ppm of NO3 via KNO3, maybe less if the fish loading/feeding is high or light is low etc.
I add about 3 ppm of PO4.
And about 20mls of Traces(TMG as a standard) per 80 liters of tank volume.

That should provide non limiting levels and with a weekly 50% water change, you are not going to build up that high.

If you wish to target specific ppm's, then you should use the EI dosing cal:

Nutri-Calc[v1.9.3 Mar 10/07]: an EI Dosing Calculator & Tank Size Calc
http://www.cherniaksoftware.com/home.../NutriCalc.exe

Or use the search function here.

It should pop up.

Regards,
Tom Barr
 

longhornxtreme

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Well... it seems that the nutri calc link is dead.

Thanks for your explanation Tom. I've got my micro dosing sorted out, I just wanted to try out your macro dosing for a bit. I use a combination of CSMB and Flourish for micros, and as soon as what I have left runs out I'll try out TMG.

So it's safe to say that each dose should have

20 - 30 ppm NO3 a week / 3 doses = ~8ppm NO3 / dose
3 ppm PO4 a week / 3 doses = ~ 1 ppm PO4 / dose

I tend not to trust calculators for these simple chemistry calculations as either the software is buggy, or a decimal place is off etc. Gives me a reason to use my chemistry minor for fun.

THanks!
 

Tom Barr

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longhornxtreme;22733 said:
Gives me a reason to use my chemistry minor for fun.

THanks!

Good old school is the best.
I still do it that way, even with spread sheets and all.
Old habits.

Regards,
Tom Barr
 

tim85

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Feb 7, 2009
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Tom Barr;22568 said:
Per week:
I generally add about 20-30ppm of NO3 via KNO3, maybe less if the fish loading/feeding is high or light is low etc.
I add about 3 ppm of PO4.
And about 20mls of Traces(TMG as a standard) per 80 liters of tank volume.

I have just started dosing 3tsp KNO3 and 1tsp KH2PO4 for my 180g on Sundays (50% wc) , Tuesdays and Thurdays. I also put in 1tsp CSM+B on Mondays, Wednesdays and Fridays.

According to Chuck's calculator I am doing like 15ppm NO3 and 5ppm PO4 on EACH of the 3 days of dosing. I have 1.6wpg of light and pressurized CO2. Fish load is low. Am I dosing too much ?
 

ccLansman

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YES, your light is low. I would watch out, 1 tsp KH2 seems over kill, if its 1/2 KN03 to 1/8KH2 on a 60 gal, if we x3 for 3x the tank vol i would see 1.5 and 3/8...
 

timmo11

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Tom Barr;22568 said:
...

You can also use a density of the substance and that the 1/4 teaspoon = 5mls or 5 cc's.

...
Tom Barr

Tom I think this is a typo unless US teaspoons giant sized?

1/4 metric teasponn = 1.25mL

Tim
 

Tom Barr

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Yes, 1.25mls not 5mls, yes, it's a typo. Thanks for catching it.

Reagrds,
Tom Barr
 

Martin

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In Nutricalc... do you guys know the percentage of N in KNO3 etc?

the ferts sold in the States differ quite a lot from what I can buy..

here it's 13,7%N I believe it is a lot higher in the States?

what % does Nutricalc use?
 

Tom Barr

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% N or % NO3?

That will make a large difference.
Most talk about NO3 ppm's, not N. Research tends to talk N and farmers do as well.

14 grams/mol for N, 101gram/mol for KN03=> ~ about 13.9% N, per gram of KNO3.

Sounds like the same stuff, KNO3 is KNO3 the world over.

Regards,
Tom Barr
 

Martin

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Hi Tom..

Well.. when looking at Chuck's calculator he lists it as:

K - Potassium 38.7%
NO3 - Nitrate 61.3%


I'm talkin NO3 of course..