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Discussion Starter · #1 ·
Hi all,

I will be moving to dry ferts very soon but would like to use up the remainder of my Seachem products before I start using the dry since I have the larger 2L and 4L jugs. I was wondering if there are concerns with mixing the following Seachem products into 2 solutions to use for dosing?

Fluorish
Nitrogen
Phosphorous
Potassium
Iron
Trace

I heard that Fe and P shouldnt be mixed as it becomes insoluble. Are there any other concerns? I have an autodoser that has 2 dosing channels which is why I would like to make 2 solutions so any suggestions would be helpful. I will also eventually be looking to combine the dry ferts into 2 solutions for dosing as well via PPS Pro or EI but that is a discussion for later (unless someone has any comments regarding mixing dry into solutions).

Tank is 60 gallons with Compressed Co2, dual T5HO geissman flora bulbs and a Finnex Ray2 in case anyone needs to know that info.

Thanks!
 

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Mix NPK in one solution then trace and iron in the other. Any link to the dosing pump you used? About how much did it run you?
 

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I'm confused. According to Seachem's chart it's okay to dose Iron and Phosphorus at the same time. How is that any different than mixing them?

See chart: http://www.seachem.com/support/PlantDoseChart.pdf
When dosing them, you are putting them into a much larger volume of water, so there is less chance that ferric phosphate will precipitate out.

However, when storing more concentrated solutions together, there is a higher chance.

Some people have noticed when dosing them immediately one after another, a slight haze can develop (this is likely the ferric phosphate).
 

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I mix seachem products for auto dosing. It works fine. Keep npk separate. I keep N separate from all the others though (3 channel pump) because when combined, I got bad molding problems.
 

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Discussion Starter · #7 ·
Thanks everyone for the replies. Very helpful as usual. Will probably add excel in to prevent molding as it sounds like that is a good preventative measure.
Should I bother also adding the Seachem Fluorish comprehensive into the mix?

@ JeffE - I bought the GHL Profilux 4 pump and I think it was around 400 Canadian dollars. I have 2 60 gallon tanks that are identical and this pump services both tanks with 2 pumps each. Works quite nicely so far.
 

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Yes you need micros.

I do:
ch1- mix of Fe + seachem comp
ch2- N
ch3- PK
 

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You don't need trace. Mix comp with fe. Comprehensive is a complete micro mix.
 

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Discussion Starter · #11 · (Edited)
I have been doing the autodosing with the Seachem products combined for a bit now and things seem a bit off (signs of some deficiencies) so I am wondering if I am dosing the right amounts.

For example:
I have combined the FE and Comprehensive into 1 solution but I suspect that I might be dosing the incorrect amount. Looking at the YANC nutrient calculator for EI dosing it states that each dose for the 2 should be 35 mL of comprehensive and 11mL of Iron separately. So I have mixed these at 380mL comp and 119mL FE to fill a 500mL bottle. Am I right that I should be dosing 46mL each dose 2-3 times a week seem to be the correct math here or am I out to lunch?
 
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