AN 3-part ph-perfect with RO Water. How much Mg and S do you supplement?

Hi,

I am using AN 3-part ph perfect fertilizer with R/O water and my plants developed a Magnesium and what it seems to be a Sulfur deficiency too.

After looking for the reasons I used this nutrient calculator.

By using this calculator I figured out that the AN fertilizer barely contains any Magnesium and Sulfur.

I assume they solely rely on the tapwater to supply Magnesium and Sulfur.

If you are using AN with RO water I am interested to know how Magnesium and Sulfur you are supplementing? (ml or ppm, or both)

Some PPM stats:

AN 4-4-4 (per liter): 5ppm Magnesium, 9ppm Sulfur
GHE Lucas Formula Veg 5M-10B (divided through 3.8 to be comparable to AN'S per litre ratio): 46ppm Magnesium, 30PPM Sulfur
GHE Lucas Formula Bloom 8M-16B (divided through 3.8 to be comparable to AN'S per litre ratio): 73ppm Magnesium, 49ppm Sulfur

http://www.genhydro.com/genhydro_US/floraseries_calculator.html

i only use micro and bloom and stopped using grow and never had to use supplements again, other then pH up

if your using cutting edge solutions 3 part you would need to supplement with some Epsom salt cause it has 0.5% less mg then General hydroponics and has higher p-k for the bloom part

my purple kush likes

with some botanicare's pH up (potassium bicarbonate) and some Epsom salt

making the total K and MG higher


BUT other strains DO NOT eat as much as purple kush and require something like

then add some pH up and Epsom salt

Op if your getting multiple problems like that you may be under feeding. Are you following directions on bottle? Just a little info too the only reason advanced made a cal mag supplement is because people were bitching about them not having one and if memory serves me they don't even make a cal mag anymore. Meaning that you don't need to supplement with it. I ran sensi ph perfect for years with ro and never used calmag once in a medium of rockwool at that. I urge you guys who are confused with how to implement the line to call AN customer support. They will talk you through the process on the phone while you mix and water. Ph perfect kinda depends on being ran how the bottles say. Of course you can back off a little but for the most part follow your directions on bottle.