Hi Tom,

Thank you for replying.

Tapwater over here= PO4 < 0.1 and NO3 < 1 ppm, so basically nothing.

Reading the works here I'll start dosing to reach the following values and then respond to the plants needs by adjusting dosing:
- CO2 30ppm
- K+ 20ppm
- NO3 30ppm
- PO4 1.2ppm (keeping "redfied ratio of N:P in 16:1" in mind)
- Mg 15ppm (4ppm in tapwater)
- Ca 15ppm (40ppm in tapwater, so that's enough)
- GH 5
- SO4 = ???
- Fe2 0,5ppm
- trace elements (I'll try ordering some american products to follow your work and later on trying the european products based on the experience.)

I will start my large tank (1,60 x 0,80 x 0,55 meters = 700 l with 300Watt of standard T5 tubes) which will be delivered today with the emersed setup, also VERY interesting and I will give it a go. To bad I don't recognise the materials you folks use over there, like fluorite.

Ordering products, start dosing, experience and read the articles and forum over and over to finetune EI. Guess that will be it for me the upcoming months!

Please continue this forum and site for the hobby, I'll try to spread the word in dutch if it works and I'm sure the EI principle will. Now it's my challenge to master it.

Cheers, Koen.

Any comments about the values and especially SO4? Tapwater over here has very low values of sulfate.