If you are just starting (assumed based on your post count), a 50% weekly water change makes the system easier to balance. Sure, you can do less (% or frequency), but then it is easier to accidentally get your ferts too high or too low. Also you are using a small tank, so measurements are smaller and not as precise (1/32 of a teaspoon??). EI and modifications of it seem to be easier to manage. You also don't have to do as much testing with EI methods.
Besides, you have a 10 gallon tank - if you do 3 gallons tap and 2 gallons distilled per week it is still cheap!
72g bowfront planted, CO2, 4x - T5HO, Eheim 2213 and 2217, 2 angels, pristella tetras, blue tetras, betta, albino bristlenose pleco, albino cories. Sword, vals, hygros, ludwigias, java moss and fern, anubias
2g Mac-quarium. Clown gravel, fluorescent plastic plants, and 2 guppies.