Plant help. flushing

On last 2 weeks of flowering and I'm starting to flush them for these last two weeks. should i give them Calmeg or plain water?

Plain water, otherwise, what's the point?
Don't you want 'everything' out?

Plain water, only additive I would suggest is "Clearex" by botanicare, It actually helps with the flushing process

true true thats what i figured i just noticed they were yellowing a lot ill post a few pics thanks for advice first grow