IFC Aquarium Fertilizer Calculator

[Hanuman]

The figures appear to be incorrect for the APF UK EI starter kit. Manufacturer instructions state a ratio of 4-1-6 teaspoons of KNO3, KH2PO4, MGSO4 respectively. Roughly 40g-5g-15g.
This option on the calculator computes:
19.02g KNO3 (roughly 4 teaspoons)
5.02 gKH2PO4 (roughly 1 teaspoon)
57.46g for MGSO4 - which is more like 12 teaspoons.

1. What version of the calculator are you using?
2. Which calculator are you using? (target, DIY, remin?)
3. Please post the dosing regime you used.

Thank you.

 

[dw1305]

Hi all,

......This option on the calculator computes:
19.02g KNO3 (roughly 4 teaspoons)
5.02 gKH2PO4 (roughly 1 teaspoon)
57.46g for MGSO4 - which is more like 12 teaspoons.

I can't check at the moment, but I'm guessing that the difference occurs because of the "water of crystallization".

What this means is that "MgSO4" is actually the heptahydrate "MgSO4.7H2O" or Epsom Salts and only 10% magnesium (Mg).

Cheers Darrel

 

[Zeus.]

The figures appear to be incorrect for the APF UK EI starter kit. Manufacturer instructions state a ratio of 4-1-6 teaspoons of KNO3, KH2PO4, MGSO4 respectively. Roughly 40g-5g-15g.
This option on the calculator computes:
19.02g KNO3 (roughly 4 teaspoons)
5.02 gKH2PO4 (roughly 1 teaspoon)
57.46g for MGSO4 - which is more like 12 teaspoons.

Looking into this and it looks like its down to an old calculation done by myself for my own personal use pre 2018. That's before the idea of doing a fert calculator hadn't even crossed my mind. Then the incorrect values 'ppms' was just accepted as correct. Myself and @Hanuman have had a look at the error already and should have a correction out soon.

In our defence we was more focused on other technical issues of the calculator at the time and the ppms of APFUK double check slipped through the net. All my fault .

Well spotted all the same and thanks for bring it to out attention

 

[Hanuman]

Looking into this and it looks like its down to an old calculation done by myself for my own personal use pre 2018. That's before the idea of doing a fert calculator hadn't even crossed my mind. Then the incorrect values 'ppms' was just accepted as correct. Myself and @Hanuman have had a look at the error already and should have a correction out soon.

In our defence we was more focused on other technical issues of the calculator at the time and the ppms of APFUK double check slipped through the net. All my fault .

Well spotted all the same and thanks for bring it to out attention

Don't beat yourself up. I'm guilty as charged as well. I've always accepted those values without double checking them myself.

I looked at the old calculation that you are reffering to and those calculation are in fact in perfect line with the guideline of APFUK so I am clueless as to why we have the ppm values in the IFC calculator that we have today. In a way, these values do not look like an error to me since all values are off, although they clearly do no match what APFUK prescribes. There is more to this than meet the eye and will update the calculator once we get to the bottom of this.

 

[Hanuman]

@Jake5tar
Regarding APFUK EI Starter 1 Kit here is the deal:
- Both @Zeus. and myself wrecked our brains to find out why those numbers were. Since we couldn't come up with a good reason, I simply went through the path of least resistance and I measured the teaspoons in accordance with the guidelines of APFUK. For the sake of homogeneity I did 10 measurements for each salt. Results are shown below:

For anyone willing to prove I'm off, keep in mind that these measurements can be slightly (if not greatly) different for obvious reasons (teaspoon size (yes they can differ), age of salt, leveled or heaped etc etc etc). This is why APFUK clearly states these are guidelines. All measurements I took were done standard, that is, I leveled the excess with a card each time I scooped the salt from the container.

This will now serve as a reference for future questions regarding this product. So, like we say during weddings, speak now or forever hold your peace.

As for the request of @Hufsa, we have also added Calcium sulfate hemihydrate (CaSO4)2(H2O) / Ca2H2O9S2 / CaSO4*0.5H2O. By doing so we also uncovered what seems like a bug in the Rotala Butterfly calculator when calculating this hydrate. I am still awaiting @fablau feedback on the matter but I have already 3 sources telling me something is off.

In the next update we are also adding the following new products.
APT Sky: remineralizer
Masterline AIO Soil: fertilizer
Masterline AIO Golden: fertilizer
Masterline AIO: fertilizer

I don't see the point in adding other products from Masterline. Those should suffice.

I have already done all the updates and will send the file to @zeus for a final checkup before release.

Any product request at this point will be done in the next update.

Peace.