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
lots to learn...
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as always, any comments, questions or criticisms are greatly appreciated.