Mono Potassium Phosphate KH2PO4 - The Planted Tank Forum
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post #1 of 11 (permalink) Old 01-20-2020, 11:39 PM Thread Starter
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Mono Potassium Phosphate KH2PO4

I have been using PPS-Pro for several years. Today as I was mixing up more Micros and Macros I measured Mono Potassium Phosphate KH2PO4 wrong. Suggested amount is 2.9 grams and I mixed in 4.5. Forgot to remove it before taring and adding MgSO4.



Any concern with the additional 1.5 grams of KH2PO4? Both tanks are high light CO2 injected and heavily planted.
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post #2 of 11 (permalink) Old 01-21-2020, 01:14 AM
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Curious to see what others will say but in the meantime I can attest that I've overdosed far more PO4 than that and didn't have a problem. I'd continue using it, and when about 1/4 of the bottle is gone, just add your other macros at 25% to the bottle. That should get it pretty close.
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post #3 of 11 (permalink) Old 01-21-2020, 02:06 PM
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How much are you adding, and to what sized aquarium? We can calculate difference in final concentration if we have these two parameters

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post #4 of 11 (permalink) Old 01-21-2020, 03:01 PM Thread Starter
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How much are you adding, and to what sized aquarium? We can calculate difference in final concentration if we have these two parameters

I am dosing 5 ml of Macros daily to a 29 gallon tank. Water volume in the tank is roughly 25 gallons including the water outside the tank in the two canisters.
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post #5 of 11 (permalink) Old 01-21-2020, 05:19 PM
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I do not think it will be a big problem. I would just remake the solution if you are concerned though as the salts are not expensive. I don't really know what the most ethical way to dispose of fertilizer solutions is though. Maybe just use it on garden plants?

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post #6 of 11 (permalink) Old 01-22-2020, 02:16 AM
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Quote:
Originally Posted by xjclassic View Post
I have been using PPS-Pro for several years. Today as I was mixing up more Micros and Macros I measured Mono Potassium Phosphate KH2PO4 wrong. Suggested amount is 2.9 grams and I mixed in 4.5. Forgot to remove it before taring and adding MgSO4.







Any concern with the additional 1.5 grams of KH2PO4? Both tanks are high light CO2 injected and heavily planted.
I'm a total beginner with dosing regimens, etc, but can you just proportionately increase the amounts of the other macro nutrients that you are supposed to add and dilute back to the correct concentration?

For example, say you added about 80% more KH2PO4 than you should have. Can you just add 80% extra of the other ingredients and then dilute the whole mixture back down? If 2.9g of KH2PO4 per 500 mL (or whatever volume of water you are using) is the correct concentration, then 4.5g per x mL would be the same dilution rate (where you would cross multiply to find x). So add the dry mixture to about 776 mL of water to get the approximate correct dilution.

But it has been a very long time for me since college chemistry lab, and math has never been my strong suit so take that with a grain of salt (pun intended!)



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post #7 of 11 (permalink) Old 01-22-2020, 02:35 AM
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I'm a total beginner with dosing regimens, etc, but can you just proportionately increase the amounts of the other macro nutrients that you are supposed to add and dilute back to the correct concentration?
You are way overthinking this.

IMO, not only should you not worry about it, but who knows your plants might like the extra PO4......most do.

I would relax, dose what you have, and observe the plants.

It may even be a learning opportunity.


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post #8 of 11 (permalink) Old 01-22-2020, 09:59 PM
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Should be fine. I've dosed a ton of it when I thought I had a major shortage. Short term results were a TON of plant bubbling. I didnt see any long term issues.
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post #9 of 11 (permalink) Old 01-23-2020, 03:00 PM
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I am dosing 5 ml of Macros daily to a 29 gallon tank. Water volume in the tank is roughly 25 gallons including the water outside the tank in the two canisters.
Oops, we'll also need to know the volume of the stock you made to get an actual result.


However, 1.6 extra grams in some volume of stock fertilizer, of which you're only adding 5 mL to 25 gallons of water -- I would not worry too much about adding too much excess phosphate.

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post #10 of 11 (permalink) Old 01-23-2020, 07:56 PM Thread Starter
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Oops, we'll also need to know the volume of the stock you made to get an actual result.


However, 1.6 extra grams in some volume of stock fertilizer, of which you're only adding 5 mL to 25 gallons of water -- I would not worry too much about adding too much excess phosphate.

Thanks for the input guys. The tank also have a heavy bio-load and I have never check my tap for PO4. Also they were 500ml containers. On a plus note I had 250ml left in a bottle from the upstairs tank. Blended the two and not the concentration is even closer.
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post #11 of 11 (permalink) Old 01-25-2020, 12:54 AM
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twice in 10 years I've had API phosphate kits go bad.
The first time, I started scratching my head after I'd had to weekly add KH2PO4 for over a month.
Then I brewed up a test solution: major fail!
Then I got a new kit and found that the solution would turn pitch black! The card show 10ppm as black.
I did aggressive water changes (60%) more than a few times before the meter budged! I can't guess how high the phosphate level was, but it must have been enormous.
However, I observed no bad results!

About a month ago this same scenario repeated itself, dosing a very low P reading to +1 or +1.5 three times before getting a new kit. P was just over 5ppm this time
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