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kisanjong / rotalabutterfly

Planted Tank Nutrient Calculator
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KCl nutrient output error #16

Closed kisanjong closed 9 years ago

kisanjong commented 9 years ago

KCl nutrient output. The ppm of K is correct but the ppm of Cl is not. This is directly the result of the original percentage value of the program. K and Cl should be near the same ppm, K slightly more; e.g. K=12.9ppm, Cl=11.7ppm (not 4.5ppm as the output).

fablau commented 9 years ago

Jason, do you think that's a problem in the compounds definition file or the calculations of the PHP backend?

kisanjong commented 9 years ago

I've not looked but I think the calculations, it may be worth checking the compounds file first, just to check?

fablau commented 9 years ago

Yes, I see the following defined in the compounds for KCl:

KCl: K: 0.524447 Cl: 0.18401 tsp: 4500 sol: 344 target: K

I don't know any reference to compare the above data. Do you? Just to let you know, there's no custom calculation for KCl in the back-end, therefore I guess the problem is just in the compound definitions above.

Audionut commented 9 years ago

Zorfox from the plantedtank.net gave me these instructions.

"The reason I showed you this is that you can add any fertilizer you like if you know the composition of the molecule. You can get that by using a molar mass calculator (http://www.webqc.org/molecular-weight-of-KCl.html). If you enter KNO3 you'll see this

Symbol Element Atomic weight Atoms Mass percent K Potassium 39.0983 1 38.6717 % N Nitrogen 14.0067 1 13.8539 % O Oxygen 15.9994 3 47.4745 %

Those are the same numbers listed in the ini file (move the decimal to the left two places though). NO3 is calculated off N. Otherwise, it's just the composition.

The sol (solubility), tsp (teaspoon weight) can both be set to 1 if you don't know them. Target needs to be one of the elements."

So the correct KCl values would be.

KCl: K: 0.524448 Cl: 0.475552 tsp: 4500 sol: 344 target: K

kisanjong commented 9 years ago

Thanks audionut I'm just about to update this on rotalabutterfly.com so we can confirm its working before pushing it to github.

Great link :)

kisanjong commented 9 years ago

OK I've changed the compounds on rotalabutterfly.com and the result looks much the same as the K as it should.

Please test

kisanjong commented 9 years ago

Its Now confirmed by three users that the results are correct.

Thanks for your help :)

Issue closed!

fablau commented 9 years ago

Wonderful! Glad you sorted that out guys!!