First grow. Have a scrogged White Widow that in its tenth week of flower. She’s a beauty. I’ve read to start using plain water two weeks before harvest. I’ve read to harvest when 3/4 of the trichomes are amber. I’ve read that WW needs about ten weeks in flower. Question: If the trichomes are all still milky, how do I know when to switch to plain water? I guess the real question is once they start turning amber do I still have two weeks to flush? Thanks.