calling help from all Gurus.

[jules2k]

Im almost done using all of my Pfertz and I would like to re-use those bottles.
total bottles are 4 with 500ml each bottles.

According to Pfertz instruction each pumps is roughly 1ml so I would re
quired to do 6 pumps for my 55gallon.

I just ordered some dry ferts from aquariumfertilizer.com and I need your help making these cocktails.

This is what I ordered
KNO3
KH2PO4
K2SO4
CSM+B plantex

can you please give the cocktail receipe to put in 500ml bottles for each?
N-
P-
K-
Micros-

[Hoppy]

The bottle holds 500 ml and each dose is 6 ml - say 5 ml to make it simpler. You need to put 100X the desired dosage of each fertilizer in a bottle and fill the bottle with water. The desired dosage is up to you. If you are going to try the EI method, that is one thing, but if you want to run lean on nutrients, that is a different thing.

[jules2k]

each pump from the bottle is 1ml.

[sewingalot]

Then you would use 500x, not 100x. The principle is the same.

Edit: Actually, you may want to wait and follow Hoppy's advice. He's smarter than me.

[Hoppy]

Originally Posted by jules2k

each pump from the bottle is 1ml.

That doesn't matter. It is the total amount you want to pump in for each dose that matters. With a 500 ml bottle, if you figure you will pump in 5 ml, 5 pumps?, each time you dose the tank, then you want 100 times the amount of each dry fertilizer per dose in the bottle to be mixed with the 500 ml of water. Then your 5 pumps, if that is what it is, will produce a 5 ml slug of water/ferts, and the bottle will hold enough for 100 doses.

This works very well for the EI dosing method, because we have a table of the approximate volumes of each fertilizer to use for each dose for each tank size, measured in teaspoons. If that table calls for 1/2 tsp of KNO3, for example, per dose, you would put 100 x 1/2 tsp, or 50 tsp of KNO3 in the bottle to mix with the 500 ml of water.

The first problem you will run into doing that is the limit on solubility of each of the ferts in water. I am sure you won't be able to dissolve 50 tsp of KNO3 in 500 ml of water. So, if you need to dose 1/2 tsp of KNO3 per dose you will need to make the amount of water per dose be much more than 5 ml, probably more like 15 ml. Then the bottle only holds 500/15 or 33 doses, with each dose being 15 pumps, and you would put only 33 x 1/2 tsp of KNO3 into the bottle to dissolve in the 500 ml of water.

I'm probably just confusing you - if so, sorry.

EDIT: It just occurred to me that you may want to know how much KNO3, for example, to add to the bottle so one pump increases the ppm of KNO3 in the tank by some specific amount. That isn't hard to figure out, but my brain is telling me to lay off this stuff for now, so I will let someone else figure that part out.

[jules2k]

Originally Posted by Hoppy

That doesn't matter. It is the total amount you want to pump in for each dose that matters. With a 500 ml bottle, if you figure you will pump in 5 ml, 5 pumps?, each time you dose the tank, then you want 100 times the amount of each dry fertilizer per dose in the bottle to be mixed with the 500 ml of water. Then your 5 pumps, if that is what it is, will produce a 5 ml slug of water/ferts, and the bottle will hold enough for 100 doses.

This works very well for the EI dosing method, because we have a table of the approximate volumes of each fertilizer to use for each dose for each tank size, measured in teaspoons. If that table calls for 1/2 tsp of KNO3, for example, per dose, you would put 100 x 1/2 tsp, or 50 tsp of KNO3 in the bottle to mix with the 500 ml of water.

The first problem you will run into doing that is the limit on solubility of each of the ferts in water. I am sure you won't be able to dissolve 50 tsp of KNO3 in 500 ml of water. So, if you need to dose 1/2 tsp of KNO3 per dose you will need to make the amount of water per dose be much more than 5 ml, probably more like 15 ml. Then the bottle only holds 500/15 or 33 doses, with each dose being 15 pumps, and you would put only 33 x 1/2 tsp of KNO3 into the bottle to dissolve in the 500 ml of water.

I'm probably just confusing you - if so, sorry.

EDIT: It just occurred to me that you may want to know how much KNO3, for example, to add to the bottle so one pump increases the ppm of KNO3 in the tank by some specific amount. That isn't hard to figure out, but my brain is telling me to lay off this stuff for now, so I will let someone else figure that part out.

I really value your advice, thank you very much.

[jules2k]

that makes perfect sense.