I'm glad it works for you, but many (including myself) have spent years struggling with this method. Part of the problem is that many fail to note the part about adjusting levels to their tank as needed instead of blindly going with full EI.
But even a 50% weekly water change is not enough to prevent nutrient buildup over time. And all those nutrients in the water make a ripe recipe for algae as soon as something goes wrong (dead fish, plants suddenly deteriorate in health for some reason, etc.). Notice how many EI users are constantly battling algae. Personally I prefer to focus on growing the plants and arranging them into a nice scape than pulling out hair algae every 3 days.
Its a valid point. I also dont like the idea of 50% water change. Even 20% is sometimes a lot (even for my 10G
I saw a post on aquatic plant central by "Left C" he calculated the amount of Macros (Nitrogen , phosphorus and Potassium) as the same strenght as the seachem dosing to replace the macros with the similar amount as shown on the chart. Seachem Dosing Calculator/Chart - Fertilizing - Aquatic Plant Central
(check third post)
According to his calculations:
The following dosing solutions will be practically the same strength as Seachem's macronutrient products according to the online calculators. You then go by Seachem's recommended dosing amounts on the calculator.
- Add 62.2 grams or 11⅛ tsp of KNO3 to 500 mL of distilled water for F. Nitrogen Substitute
- Add 3.5 grams or ¾ tsp of KH2PO4 to 500 mL of distilled water for F. Phosphorus Substitute
- Add 51.0 grams or 8½ tsp of K2SO4 to 500 mL of distilled water for F. Potassium Substitute*
*(This amount approaches the maximum solubility of K2SO4 of 12 grams per 100 mL of distilled water. You will probably need to shake the container each time prior to dosing.)
This is another possibility to try and play around to reach your tanks need. So then we will not need to damp all nutrients and do a heavy water change at the end.