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post #1 of 7 (permalink) Old 08-07-2011, 09:19 PM Thread Starter
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epsom salts

how do i measure it to get a desired amount. i've tried multiple nutrient calcs. and i get around 5.6 grams to get 5 ppm. and some other calc said that was 1.18 teaspoons... IM CORNFUSED

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post #2 of 7 (permalink) Old 08-07-2011, 09:23 PM
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use the fertilator at APC

http://www.aquaticplantcentral.com/f...fertilator.php

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post #3 of 7 (permalink) Old 08-08-2011, 12:17 AM Thread Starter
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awww bummer i gotta make an account to get there

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post #4 of 7 (permalink) Old 08-08-2011, 12:40 AM
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5.6 grams of MgS04.7h20 is 1.0914 teaspoon, says my calculator.


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post #5 of 7 (permalink) Old 08-08-2011, 12:43 AM
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Trying to measure a solid by volume is just about impossible to do accurately. It depends too much on the grain/crystal size, and that's going to change by the brand of epsom salt you buy and such. If you don't have an accurate mass balance, you could try 1 1/8th teaspoon and see what happens. Is this a value you need to get a particularly accurate measurement of?

You could also construct a mass balance of your own and use 2 clean new pennies on one side (5g) and add epsom salt to the other side until it balances. That's probably not worth it though unless you've got a small kid to science-ify or you really are determined to get 5g without much error.
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post #6 of 7 (permalink) Old 08-08-2011, 12:45 AM
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It is impossible to do accurately but fine with an estimation.


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post #7 of 7 (permalink) Old 08-08-2011, 01:09 AM Thread Starter
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Well i guess thats why i do EI. Just didnt know how far off my numbers were. Glad i was close to someone else

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