Mixing dry fertilizer for auto dosing question - The Planted Tank Forum
 
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post #1 of 12 (permalink) Old 05-27-2019, 08:54 PM Thread Starter
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Mixing dry fertilizer for auto dosing question

Earlier today I looked up dosing KH2P04, Mono Potassium Phosphate and K2so4, Potassium Sulfate on Rotala Butterfly.

I am trying to mix into 1000 ml. of distilled water: 15 tsp of the K2so4, Potassium Sulfate and 4tsp of the KH2P04, Mono Potassium Phosphate.
But it has been about 2 hours and there is still white powder that doesn't seem to want to dissolve.

The tank is 135 gallons, no co2, 20 to 30 ppm nitrate, 2x95 watt compact fluorescents and 2x55 watt compact fluorescents, one AI Prime at 45%

I was planning on dosing 5ml every other day.
The result of the dose into 135 gallons should be P&P04 at .2 ppm and K at .48 ppm.

I am just trying to get the ball rolling with the auto dosing, but 15 tsp of the K2so4, Potassium Sulfate into 1000 ml of water
seemed like a lot for such a small .48ppm gain.

I checked and checked again, but Rotala Butterfly keeps saying the same thing.
Does this sound about right?

I am dosing CSM+B and that seems to be working out just fine.
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post #2 of 12 (permalink) Old 05-27-2019, 09:01 PM
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Quote:
Originally Posted by Jbubba001 View Post
Earlier today I looked up dosing KH2P04, Mono Potassium Phosphate and K2so4, Potassium Sulfate on Rotala Butterfly.

I am trying to mix into 1000 ml. of distilled water: 15 tsp of the K2so4, Potassium Sulfate and 4tsp of the KH2P04, Mono Potassium Phosphate.
But it has been about 2 hours and there is still white powder that doesn't seem to want to dissolve.

The tank is 135 gallons, no co2, 20 to 30 ppm nitrate, 2x95 watt compact fluorescents and 2x55 watt compact fluorescents, one AI Prime at 45%

I was planning on dosing 5ml every other day.
The result of the dose into 135 gallons should be P&P04 at .2 ppm and K at .48 ppm.

I am just trying to get the ball rolling with the auto dosing, but 15 tsp of the K2so4, Potassium Sulfate into 1000 ml of water
seemed like a lot for such a small .48ppm gain.

I checked and checked again, but Rotala Butterfly keeps saying the same thing.
Does this sound about right?

I am dosing CSM+B and that seems to be working out just fine.

5mL dose into a 135 gal tank is where your issues are. Try aiming for a larger dose = less needed to dissolve. You'll have to mix up batches more often, but the doses will be more stable and accurate, and you'll be able to get the products to dissolve properly.

You can try some acid in the mixing bottle to lower pH slightly... might help dissolve more....

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post #3 of 12 (permalink) Old 05-27-2019, 10:55 PM Thread Starter
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I picked up a 1 quart plastic bottle at Walmart, I figured that it would be sort of handy.
There are 100mm markings on it from 100ml up to 900ml, it looked like filling it way up to the top would be pretty close to 1000ml.
They did have a larger 2 quart one that went up to 1800ml.
I will pickup the 2 quart one tomorrow.

it has been 4 hours now, and still powder on the bottom.

thanks for the help.
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post #4 of 12 (permalink) Old 05-28-2019, 10:15 AM
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No need to go buy anything yet. A solution can only dissolve so much. Shake current bottle up well and pour off 500ml, add 500ml distilled water. Wait and see if 2000ml will do it 1st, if not half it again. That will mean you need 4000ml of distilled water to dissolve it all. Might as well just get gallon jug at that point, 3785ml.
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post #5 of 12 (permalink) Old 05-29-2019, 06:32 AM
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I have used an autodoser on and off for about 3 years. My main advice is to go more dilute ex: dosing at a rate of about 0.5-1mL per gallon of tank water. So for a 100g tank. Dose 50mL. This is because you'll get better accuracy of each dose with a bigger volume and importantly, you won't get salt crust on your input lines or precipitation on the bottom of your dosing bottles that may clog the lines.

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post #6 of 12 (permalink) Old 05-30-2019, 01:21 AM
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Potassium sulfate solubility in water is 120 g/L. Are you exceeding that?
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post #7 of 12 (permalink) Old 05-31-2019, 07:01 PM Thread Starter
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I tried to mix 15 tsp that is supposed to be 75 grams, I think into 1000 ml of distilled water.
But it definitely doesn't work.
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post #8 of 12 (permalink) Old 06-13-2019, 07:10 AM
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This sounds good but I'm curious, is this okay to use to all plants? Or there are specific plants where you can use it? Thank you!
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post #9 of 12 (permalink) Old 06-13-2019, 09:21 AM Thread Starter
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It is for everything in the fish tank.

As the plants grow, they consume macros and micros.
If you don't replace what has been consumed, the plants growth is going to slow down, and they won't look so good.

So yes it is for everything in the tank.

If you have a sword plant they are heavy root feeders, and you are supposed to put root tabs in the substrate around them.
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post #10 of 12 (permalink) Old 06-13-2019, 02:38 PM
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Use boiling or very hot water, this helps out in quickly dissolving chemical compounds.


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post #11 of 12 (permalink) Old 06-13-2019, 02:46 PM
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I use a battery operated wisk used for making foam for my coffee. It works well.
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post #12 of 12 (permalink) Old 06-13-2019, 03:06 PM Thread Starter
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I never thought of using hot water, thanks.
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