Allwx the three bags will work but it will take longer to strain with just 3 bags.When I trim I make finger hash with what I get off fingers and scissors.here is a link to them also they give a 20% discount to medical patients. freshheadies.com/catalog
I just flush the last week week and a half with plenty of water. Dependes how hard you were hitting them with nutes at the end.Can I ask why you did that gal of nute mix after you flushed?