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post #1 of 6 (permalink) Old 05-11-2015, 06:12 PM Thread Starter
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Quick EI question

I Just purchase GLA's EI fert kit. I notice the kid includes K2SO4. The instructions I've found from Tom Barr online for non co2 Low tech tanks does not include K2SO4 in the dosing. Only KNO3 and KH2PO4.

Im just wondering why it isn't included. Does the non co2 tank not need it? or is it just simplified?
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post #2 of 6 (permalink) Old 05-11-2015, 09:01 PM
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Many folks find that KNO3 provides enough K on its own. However, there are situations where it is useful.

-If you have a particularly potassium hungry tank, K2SO4 allows you to raise the K without adding more NO3.

-Also, if you are overstocked in fish, you probably already have a lot of NO3, some folks (like me) half-dose KNO3 and use K2SO4 to make up with it. Just make sure you calibrate your test kit before deciding you already have plenty of NO3.. many tests read very high.

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post #3 of 6 (permalink) Old 05-11-2015, 09:21 PM
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Yep - I've looked into this too. The dosing guide I was reading when I ordered my ferts didn't include it, so I never ordered any. Like Matt said, a lot of people think you're getting enough K in KNO3 and that the K2SO4 is very situational.
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post #4 of 6 (permalink) Old 05-11-2015, 09:33 PM
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Also, while kno3 and kh2po4 may provide enough potassium to satisfy your plants needs, adding more in the form of k2so4 will not cause any issues as long as you perform regular water changes.
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post #5 of 6 (permalink) Old 05-23-2015, 12:24 PM
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Quote:
Originally Posted by nilocg View Post
Also, while kno3 and kh2po4 may provide enough potassium to satisfy your plants needs, adding more in the form of k2so4 will not cause any issues as long as you perform regular water changes.
Have to ask..... and what if regular WC were NOT done on a weekly basis but say once a month?
Thx U

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post #6 of 6 (permalink) Old 05-23-2015, 12:33 PM
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Why not take the answer from Tom Barr, in response to similar questions I was asking.

In short, tou dose 1/4 to 1/3 normal dosing if you only do W/C's once a month.

https://www.plantedtank.net/forums/sh...09&postcount=8

And in general that whole thread is full of gems about the tradeoffs of doing water changes more or less often:

https://www.plantedtank.net/forums/sh...d.php?t=749945

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