How to go from dry ferts to liquid auto dose? - The Planted Tank Forum
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post #1 of 3 (permalink) Old 01-26-2016, 05:18 PM Thread Starter
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How to go from dry ferts to liquid auto dose?

I want to change how I dose ferts, as I travel a lot and want to buy once of those auto dose units that will work with my Apex? Does anyone have any suggestions?

Also this is what I dose now, but with dry ferts, how would I go about setting it up to auto dose liquid?

The tank is 180 gallons, with 70 gallon sump.

Dry amounts
KNO3 (approximately 3 teaspoons)
KH2PO4 (approximately 1/2 teaspoon)
K2SO4 (approximately 2 teaspoon)
Plantex CSM+B (approximately 1.5 teaspoons)
Iron Chelate (approximately 3/4 teaspoon)

Mon - KNO3, KH2PO4, K2SO4
Tues - Plantex, Iron Chelate
Wed - KNO3, KH2PO4, K2SO4
Thur - Plantex, Iron Chelate
Fri - KNO3, KH2PO4, K2SO4
Sat - Plantex, Iron Chelate
Sun - 50% water change no dosing
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post #2 of 3 (permalink) Old 01-26-2016, 11:53 PM
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How to switch from DRY to LIQUID Dosing.

1. Get some distilled water.
2. Get a measuring cup that can measure ml.
3. Get a container for a liquid ferts. I prefer the bottles with the ml indicator and a wide mouth. Good ones are the Nalgene 1400 ml BPA free water bottles (from REI).
3. Since you know your dosing amount then figure out the amount of liquid you want to dose. Ex. 20 ml per dose. The higher ml the better since if your pump dose becomes slightly off then you are not off by a lot and does not affect the dosing too much.
4. Compute 20 ml X number of doses per full bottle. So if you want to do 64 shots of 20 ml then you will need 1280 ml of water in your dosing bottle.
5. Heat up 500 ml of distilled water for 1:30.
6. Pour the warm water in the bottle.
7. Compute Fert dose x number doses you set for your bottle. Ex. You have 64 shots so 3 tsp x 64 = 192 tsp of KN03.
8. Pour the dry fert in the bottle. Mix until clear then fill up the bottle to 1280 ml.
9. Add 15-20 ml of Excel
10. Set your dosing pump to dose 20 ml per dose.

So your fert bottle contains 1280 ml of KNO3 with 20 ml dose containing 3 tsp of KNO3 for each dose.

If you are mixing macros together in one bottle them simply mix them in the bottle at the same time once you figure out to total amount of ferts per bottle.

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post #3 of 3 (permalink) Old 01-27-2016, 01:16 AM
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Wow, you're really dumping some K and NO3 into the water.

Solubility of K2SO4 (and perhaps KNO3) is going to be an issue. Wikipedia lists the solubility of dry powders. Be mindful of this when making the solutions.

Feel free to edit.
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