Can Someone Double Check My Dosing...

[themissingelf]

20 US gallon, pressurised CO2:

Pot Nitrate (KN03)
Solution = 31 grams to 250ml water.
5 ml dose = Nitrate 5ppm / Potassium 3.15ppm.

Mono Pot Phosphate (KH2P04)
Solution = 5.5 grams to 250ml water
5 ml dose = Phosphate 1ppm / Potassium ? (no idea what ppm of Pot)

Potassium Sulphate (K2S04)
Solution = 21 grams to 250ml water.
34ml dose = Potassium 17ppm

Adding it all up, I get:
Nitrate = 5ppm
Phosphate = 1ppm
Potassium = 20.15ppm

Is this the right approach? I used Chucks downloaded calculator and added together the side-effect does of Potassium with the Nitrate to the dedicated dose of Potassium.

The levels, as I've totalled them, are Chucks recommended (in the calc).

Cheers

 

[Themuleous]

Looks good to me the only thing I would suggest is you add 10ppm of NO3, as you might find 5ppm gets used up quite quickly and you dont want it running low. As a very general rule add N and P at a ratio of 10:1, ie 10ppm NO3 for every 1ppm PO4.

Sam

EDIT - dont forget to use RO water to make the stock solutions as there is likely to be existing P and N in your tap water