DIY Potassium - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 11-16-2015, 06:53 PM Thread Starter
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DIY Potassium

Some of my stem plants in my 10G are showing signs of Potassium deficiency. The symptoms are small holes in the leaves surrounded brown a dark brown and yellow outside of that. It looks like someone held a hot matchstick to the leaves. My research has shown this to be potassium deficiency. I am dosing with 1ml Flourish comp twice a week. I live in ag country and the local ag supply is hooking me up with a zip lock bag of 0-0-60 muriate of potash. I have an empty 500ml prime bottle I would like to mix up some of this and see if it helps. When the flourish is gone I plan on switching to PPS-Pro from our good friend Nilocg but until then I would like to try the KCL.

My question is how many grams to use and should I use distilled water to mix or old aquarium water.
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post #2 of 4 (permalink) Old 11-17-2015, 12:39 AM
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If you use KCl the plants will use the potassium but not that much chlorine, so it will build up in the water. For that reason I would much rather use KNO3, giving the plants both nitrogen and potassium. Or, you could use K2SO4, since plants do use both potassium and sulfur. Some people get quite a bit of nitrates from their tap water - they usually use K2SO4. Those of us who don't get nitrates from tap water usually use KNO3.

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post #3 of 4 (permalink) Old 11-17-2015, 01:17 AM
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I completely agree with Hoppy. Muriate of Potash has way too much chloride to use in a planted tank IMO. 60% potassium BUT 45% chloride! If your'e planning to change to PPS then now would be the time. Do yourself a favor and order the proper fertilizers.

I'll give you the dose, however, let me repeat. I would not use this if I were you. To target 7.5 ppm of potassium add 4.26 grams in 500 ml and dose 5ml per 9 gallons.
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post #4 of 4 (permalink) Old 11-17-2015, 03:27 PM Thread Starter
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Thanks to those who replied. I am going to continue to use just the Flourish and next week order some ferts for PPS.
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