Math+chem quizz with plantex+b - The Planted Tank Forum
 
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post #1 of 11 (permalink) Old 03-28-2006, 03:15 PM Thread Starter
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Math+chem quizz with plantex+b

Hi,

Now I know why I shouldn't have skuipped those math classes way back.

Anyway, I got some plantex+b from Greg. (Thanks Greg).

Before I get to the question here is what I have to use:

Plantex+b, measuring spoons, a bottle of plant gro 400ml, 75gal tank.

The question is, how to get the ideal concentration of liquid so that all I have to do is to drop 1 or 2 capfull(s) (10ml) in the tank.

I am about done using the plant gro fert and will need to make my first batch.
I've read that I could make a 250ml solution by adding 1 tsp of plantex, but that would mean I would have to dose 15ml in the tank.

I dont have anything that can measure 15ml so I want to use the cap of the bottle which is the equivalent of 10ml.

One or two caps and the dosing is done.

The bottle can contain up to 400ml of liquid.
I would like to find out the quatity of liquid and amount of plantex to use knowing that liquid can be up to 400ml and that i can only measure the fert using measuring spoons that go 1tblsp,1tsp,1/2ts,etc and also have pinch/smidgen/dash spoons.

Thanks.
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post #2 of 11 (permalink) Old 03-28-2006, 06:36 PM
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Quote:
Originally Posted by HammerJoe
I dont have anything that can measure 15ml so I want to use the cap of the bottle which is the equivalent of 10ml.


Thanks.
It's not that critical - use the recipe you have. Add one capful, then eyeball half a capful.

Kevin

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post #3 of 11 (permalink) Old 03-28-2006, 07:33 PM Thread Starter
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Aww, Kevin you take the fun out of it.
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post #4 of 11 (permalink) Old 03-28-2006, 07:45 PM
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In a 75g tank you could probably just dose the micros dry

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post #5 of 11 (permalink) Old 03-28-2006, 07:45 PM
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In a 75g tank you could probably just dose the micros dry

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post #6 of 11 (permalink) Old 03-28-2006, 08:07 PM Thread Starter
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Hmm, I didnt think of that...

How much stuff are we talking about here?
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post #7 of 11 (permalink) Old 03-28-2006, 10:14 PM
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Well if you dosed 15ml of the 1tsp per 250ml that would be around 16.6 doses. So I would guess to say a 1/16th of a tsp dry. Maybe a little on the heavy side of a 1/16.


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post #8 of 11 (permalink) Old 03-28-2006, 11:56 PM
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You can probably get a 5 or 10 mL syringe at a local pharmacy. Or date a nurse. Problem solved.
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post #9 of 11 (permalink) Old 03-29-2006, 12:39 PM
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The math is simple:

1 tblsp in 250ml = 15ml dose in your tank

You want to dose 10ml

Therefore, 10ml must contain same amount of plantex as the 15 ml dose above.

To accomplish this, make stock solution more concentrated by 1.5 times.

15/10 = 1.5 - 1.5 tblsp in 250 ml should do the trick. Then dose 10ml
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post #10 of 11 (permalink) Old 03-29-2006, 03:09 PM Thread Starter
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Thanks, finally someone that decided to take the quiz.

So if I wanted to dose 20ml then 250ml should have only 1/2tbls?

Btw, just to clarify, for 250ml is it one *tablespoon* or *teaspoon*?
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post #11 of 11 (permalink) Old 03-29-2006, 04:33 PM
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The Plantex recipe from Rex Grigg's site:

1 tablespoon (or 3 teaspoons) of Plantex in 250 ml water. Where did you get your recipe?


"So if I wanted to dose 20ml then 250ml should have only 1/2tbls"


No. In this case if you want to dose 20mls, the plantex concentration must be lower than original recipe that you cite, but not as low as you calculated.

15 (original dose)/20 (desired dose) = 0.75

0.75 x 1 tablespoon = 0.75 tablespoon per 250ml. Then dose 20 ml.

Easy, ain't it?
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