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Originally Posted by Wasserpest
"Manual gap dose"... you can do it. Like I said, it would be extremely easy to program the timer to do this for you as well (with the kind of timers I am using). Say you add 1/4 tsp of something every day, which keeps your levels stable. Now you change 50% of the water, and figure you need 1/2 tsp to get to the previous levels. Just set the timer to dose an additional time after the water change, and now it's all automatic  |
Yea, but then you had better make sure you do that water change when this timer expects it. If you are late, it's all messed up. That's why I stick to a manual gap dose.
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Originally Posted by Wasserpest
The question is, how exact do we need to keep the levels? EI is based on overdosing, while when you autodose, you can get the levels pretty close to what you and your plants want/need. I like lower levels, for reduced biomass production  |
In my particular setup, I found holding daily values to 12ppm Nitrogen, 1.2ppm Phosphorus, and a targeted 20-25ppm Potassium to keep growth moderate and the tank algae free. But that's a 1 yr sample of 1 person. And the Potassium values are assumptive due to lack of good measurement tools. So based on moving Potassium values up and down until I saw signs of deficiency, I concluded that my ratio of Nitrogen uptake to Potassium uptake was 1ppm:1.2ppm. I'm sure other people's results will vary...