EI method and water changes question! - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 12-09-2014, 04:06 AM Thread Starter
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EI method and water changes question!

Hi friends, so I've been doing the EI for the last moth and I'm keeping discus, so I was wondering if I could do instead of one water change, do at least two? Would it affect the dosing method or not? Thanks for helping!
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post #2 of 4 (permalink) Old 12-09-2014, 04:42 AM
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From my understanding, you can do two water changes a week. The whole idea behind EI is that when you change the water you are resetting the levels of nutrients, and if you are doing say 50% water changes then you cant get above 200% of your dosing level. so if you do two a week, it shouldn't matter as long as you dose the same in between the changes, you still wont get any higher amounts than 200% of your desired dosing level.

Im sure there are some people on here than can help you far more than I can, but in short, yes you can do two water changes a week, you just need to figure out your fert dosing

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as always, any comments, questions or criticisms are greatly appreciated.
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post #3 of 4 (permalink) Old 12-09-2014, 04:47 AM Thread Starter
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Quote:
Originally Posted by ffmurray View Post
From my understanding, you can do two water changes a week. The whole idea behind EI is that when you change the water you are resetting the levels of nutrients, and if you are doing say 50% water changes then you cant get above 200% of your dosing level. so if you do two a week, it shouldn't matter as long as you dose the same in between the changes, you still wont get any higher amounts than 200% of your desired dosing level.

Im sure there are some people on here than can help you far more than I can, but in short, yes you can do two water changes a week, you just need to figure out your fert dosing
Thanks for the help friend! Appreciate it!
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post #4 of 4 (permalink) Old 12-09-2014, 02:41 PM
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Understanding the impact water changes can make on nutrient levels is a huge part of nutrient management in the planted tank. Most eventually discover the nutrient calculators. However, there is more to that website.

Using the accumulation calculator makes it easy to see what projected nutrient levels will be based on many factors. This allows us to customize fertilizer dosing to match our personal tank parameters.

Below are two graphs the accumulation calculator generates. I added a green overlay to visualize the non-limiting nutrient levels for nitrates (5-30ppm).

The first is with normal EI dosing of nitrate (7.5ppm) every other day. The water change schedule is 50% weekly. I added a plant uptake ratio of 2ppm.





The second image is exaclty the same as the first with one alteration, water change schedule. This graph is for biweekly water changes.



We can clearly see that changing the water change schedule heavily impacts nutrient levels. In your case the levels would remain within the ranges suggested.

This is an under rated calculator IMO. Having the basic calculator is great. However, where the real magic happens is understanding the accumulation side of the coin.
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