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EI Mixture in one bottle - calculations

Aeropars

Member
Joined
9 Jul 2007
Messages
792
Location
Leicester
Hi Guys,

I'm a little stumped.

I read on James website the following for the macro mix:

Potassium Nitrate (KNO3) solution - 40g to 500ml of water.
Potassium Phosphate (KH2PO4) solution - 15g to 500ml of water.

Assuming they are in the same bottle 10 ml of the solution would provide for a 180l tank:

Potassium Nitrate (KNO3) - 2.04ppm
Potassium Phosphate (KH2PO4) - 0.48ppm

According to Nutricalc i should be hitting 2.66ppm KNO3 and 1.22ppm KH2PO4 on each dose (based on 3 doses a week for a 180l tank)

I'm confused.... can anyone explain? According to my calculations I would have to add 30g KN03 and 40g KH2PO4 to 500ml of water to reach the desired ppm from one solution.

Can anyone help before my brain melts?

Lee
 

JamesC

Member
Joined
3 Jul 2007
Messages
1,276
Location
Bexley, Kent
For a 180 litre tank you would dose 30ml of KNO3 solution and 18ml of KH2PO4 solution. If you wanted to just make a single solution then you'd have to adjust the initial amounts. That EI guide was written some years ago and I must admit it is a bit hard to follow. When I get a moment I'll redo it so a single macro solution is made and dosing is added as so many ml's per litre of tank water.

James
 
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