Phosphate level and EI dosing - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 09-05-2015, 04:01 AM Thread Starter
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Phosphate level and EI dosing

Trying to get my EI ferts straightened out. Currently dosing GLA EI fert package and Nilocg Gh booster. It's a high tech tank. My plants are doing better now, but I feel I still have a slight fert imbalance.

1" organic dirt and 2" eco complete. Today I tested my phosphate level and it's past the test kits limits. After a 50% water change I got it down to 8-10ppm. If I understand right very high phosphate is not nessessarly bad if you also dose the other ferts to match. By doing my full EI ferts though it also increases the phosphate even more. So, what do I need to dose? Should I stop dosing the KH2PO4 (p and k) and just dose K2SO4? From what I read there is one of the EI ferts you can swap out to one with out the ingredient that increases phosphate. I am slightly lost and the more I research the more I seem to over think it.
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post #2 of 7 (permalink) Old 09-05-2015, 04:50 AM
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You only need to keep 2 PPM. If you already have a test kit them simply dose to reach 2 ppm. Check the levels before your next dose or after 2 days then use the fert calculator to determine how much so you end up back to 2 PPM.


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post #3 of 7 (permalink) Old 09-05-2015, 04:53 AM Thread Starter
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But if I don't dose the kh2po4 than I loose the P. I guess that's part of my question, should I stop kh2po4 and just dose the k2so4?
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post #4 of 7 (permalink) Old 09-05-2015, 05:04 AM
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Well you could stop and check the level over the course of a few days/weeks to see if P zeros out completely.

Personally, in my high tech I need to maintain a solid 4-5 ppm or gsa starts to appear. There've been periods of time it was in the 8-10 range and I never had any problems, but I try to keep it around 4-5 nowdays.


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post #5 of 7 (permalink) Old 09-05-2015, 07:09 PM
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The amount of KH2PO4 we dose doesn't contribute enough potassium to worry about losing if you stop dosing it. Your high phosphate test result is more likely to be caused by not using the test kit correctly or a bad test kit than it is to be an accurate measurement. Does your tap water contain high phosphate?

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post #6 of 7 (permalink) Old 09-11-2015, 04:48 PM
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In a similar boat here.. PO4 was off the charts so I switched KH2PO4 out for K2SO4 in my dosing regimen. Nearly a month and six 50% water changes later, they still sit at around 8. I have 0 phosphate in my tap. Perhaps I am feeding too much pellet food or my osmocote+ tabs are leaching.
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post #7 of 7 (permalink) Old 09-11-2015, 06:09 PM Thread Starter
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My tap also has no P. I messaged Nilocg and he suggested just dosing K2so4. Im going to wait a few weeks and make sure the level stays steady, if so Ill order it and use that.
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