APC’s Fertilator question? - Fertilizing

inwu · 10-22-2009, 01:18 PM

I try to use APC’s Fertilator to calculate how much CaSO4 and MgSO4 I should add. But it only has options like (CaSO4)2.H2O and MgSO4.7.H2O. Are they the same?

Philosophos · 10-22-2009, 02:49 PM

Ya, both of them have some water bound in with them. I've seen more than a couple people forget to account this when doing their own calculations.

-Philosophos

inwu · 10-22-2009, 04:05 PM

Thanks Philosophos. I also like to thank all the people who make this wonderful tool available!

lildark185 · 10-30-2009, 08:52 PM

I also have a question regarding the fertilator. I have a 75g tank and an input of 1 tsp of KNO3 would be sufficient. Are the amounts to be added daily or once a week? If I decide to alternate the dosing of the KNO3 to every other day, would I put in 1/3 tsp every other day for a total of 1 tsp for the week?

Philosophos · 10-30-2009, 09:01 PM

Fertilator simply calculates the amount put in for the column size. If you enter 1tsp that's 1x 1tsp.

Personally I like to dose macro and micro 3x a week on alternating days, with a one day break before WC. So yes, divide by 3.

-Philosophos

tug · 10-31-2009, 04:41 AM

Hi Philosophos, Just when I thought I was beginning to understand dosing, you say something like this. Lildark's dose (1tsp KNO3 into 75G) would dose ruffly 11ppm NO3. I would dose that 3X week, (not a third of it) to maintain a minimum of 10ppm NO3.