Manufacturer doses are based on what they think you should be using. It's like someone saying use this much phosphours for PPS versus EI. It's a preference. I like EI, it just makes sense. In fact, why would anyone want to limit nutrients? Makes no sense to me. However, that's MY preference.
I'm working on a new Windows based nutrient calculator. The dry portion is basically done. I'm working on the commercial solutions portion now. I'm thinking rather than limit users to what solutions I have, let them add new ones like the ones you listed. It's all about the percentages and density anyway so why not. Math is math. The calculations are the same for Seachem or Tropica. The only difference being the percentages of nutrients.
You can do the math yourself now right? lol Decide what level YOU want to use and calculate a dose.
btw, if you want to account for the density issues add that to your formula.
what you have now...
Desired ppm / percentage * 10 = ml/liter
Just add the density which is the weight divided by the volume
example Flourish Iron is
Thats a density of 1.05 (2.1 / 2 = 1.05)
0.5 ppm (Desired ppm)
/ (1% (percentage)
* 1.05 (density)
) * 10 = 0.4762 ml/liters
Remember. Do the multiplication first
Versus 0.5ml/liter when you don't use density. Not much of a difference. I just hate inaccuracy lol. Besides, if your crazy enough to dose a 250 gallon tank with commercial fertilizer it makes a difference.
Thanks ,Zorfox ,I never thought I'd become so interested in math ,when I poured water in my tank for the first time.
I thought I smelled a rat ,when I noticed that Ferropol's manfacturer also sells a product called Algol ,an algae killer ,but which can apparently harm shrimp ,I don't exactly know what it contains.So I thought they recommended this higher dosage on purpose ,like selling the matches ,the gas ,and the fire extinguisher.
Inexperienced planted tank keepers ,like myself ,at first I didn't realise the importance of light intensity vs CO2 availability/stability ,vs nutrients.I kept my lights close to the surface ,dosed Ferropol only ,and no macros,and diy CO2(single bottle so very unstable).The result was algae ,BBA and fuzz ,mostly.I never used algae fighting products ,though ,I tried to figure out the cause ,and thanks to people on this forum ,I've learned my lesson.
I remember having read someplace that the Fe in Ferropol is EDTA ,(Fe +3) ,and the one in Fluorish Iron is Fe +2 ,according to their site.
Maybe they recommend dosing more because of this ,as Fe+3 dissipates in the water quicker than the Fe+2?
Good luck with your calc programming ,I can't wait to see the final product!