Don't ever assume they are accurate. I just found out I was actually adding twice the amount of iron into my tank so 1.5ppm of iron was actually 3ppm. Yet Another Nutrient Calculator used the information about Easy Life Ferro from the manufacturer's website which turned out to be inaccurate.
I emailed Easy Life about the discrepancy between what was labeled on the bottle and on the website and here's their reply:
"Thank you for your interest in our Easy Life products.
The label on the bottle correct, we have to change the info on our web site."
Easy Life Ferro is the same concentration as Seachem Flourish Iron so using Seachem in the calculator yielded the correct dosage amount.
HOWEVER! if you select Flourish Iron and calculate for EI, you'll get how much you should dose in mL. But if you use that amount to calculate the result of your dose, you'll get an entirely different concentration. E.g. for 10 gallons, dosing EI indicates adding 1 mL to reach .50 ppm of iron. Input this amount in "the result of my dose", you'll get .26ppm, which is half the amount! Which is correct? You'll have to do math to figure it out.
I emailed Easy Life about the discrepancy between what was labeled on the bottle and on the website and here's their reply:
"Thank you for your interest in our Easy Life products.
The label on the bottle correct, we have to change the info on our web site."
Easy Life Ferro is the same concentration as Seachem Flourish Iron so using Seachem in the calculator yielded the correct dosage amount.
HOWEVER! if you select Flourish Iron and calculate for EI, you'll get how much you should dose in mL. But if you use that amount to calculate the result of your dose, you'll get an entirely different concentration. E.g. for 10 gallons, dosing EI indicates adding 1 mL to reach .50 ppm of iron. Input this amount in "the result of my dose", you'll get .26ppm, which is half the amount! Which is correct? You'll have to do math to figure it out.