Dosing Dry Ferts - The Planted Tank Forum
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post #1 of 8 (permalink) Old 11-05-2016, 12:58 AM Thread Starter
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Dosing Dry Ferts

I'm using the GLA PPS-Pro fertilizers w/ Plantex, and the two 500ml dispensers. So there are two different mixes getting dosed daily, the Plantex in one bottle, and the other four dry ferts mixed in the second bottle.

I'd like to setup a dosing pump to add the fertilizers. Since I'm adding two different fertilizer mixes daily (the Plantex and the others) I initially assumed it would require either a dual dosing pump or two separate pumps. It occurred to me it might be okay to to mix both fertilizers (once in their liquid state) and just use one pump for both, lowering the cost and complexity of the setup.

Is it okay to mix the PPS fertilizers into a single liquid and dose that, or should they be kept separate and dosed separately?
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post #2 of 8 (permalink) Old 11-05-2016, 03:46 AM
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You cant mix macros and micros.
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post #3 of 8 (permalink) Old 11-05-2016, 11:04 AM Thread Starter
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That's surprising. After I posted I thought, "Why wouldn't it be okay to mix two liquid fertilizers?". I probably should have just asked that question. What's the reason the micros and macros are not able to be mixed?

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post #4 of 8 (permalink) Old 11-05-2016, 01:36 PM
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If you mix phosphates and iron together they form a compound that isn't water soluble. Your plants won't get the nutrients.
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post #5 of 8 (permalink) Old 11-05-2016, 01:49 PM Thread Starter
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Even if the phosphates and iron are dissolved separately, then the liquids combined after?

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22 Neons, 4 Long Skirt Black Tetras, 1 9" Pleco, 1 6" Algae Eater, 1 4" Clown Loach

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post #6 of 8 (permalink) Old 11-05-2016, 02:03 PM
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Quote:
Originally Posted by Westone View Post
Even if the phosphates and iron are dissolved separately, then the liquids combined after?
Yes, the iron and phosphate ions will react to form insoluble ferric phosphate.

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post #7 of 8 (permalink) Old 11-05-2016, 07:34 PM
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Quote:
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Even if the phosphates and iron are dissolved separately
More so because they are dissolved. Once you add them to the aquarium you have relatively low conc. of both ions so they do not precipitate as fast. However in the dosing bottle the conc. of -PO4 being quite high, will likely take out all the iron out of solution and make it unavailable to plants.

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post #8 of 8 (permalink) Old 11-06-2016, 01:30 PM
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That's why Macros and Micros are dosed on alternate days rather than on the same day.
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