Dialtone - Thank you. I'll look into this 'soluable packet' stuff. I'm currently using pH down that's red liquid. And I'll check it more often.
Yes, I hope I can time the flushing correctly. I'm pretty anxious about the whole thing. More so than when to harvest.

I'm not sure how to predict when it'll be 2 weeks before harvest. Will have to do some heavy reading on it.