to manually fush is to just turn the controller on. flood the system...then turn to drain...after its done.....do it again.Cool! what do you mean manually flush? please explain a bit more if you have time too! what your saying is to add in the nutes to the res based on gallons already in the res then add more water?
What it sounds like your saying is I need to go more by the ppm's of the res in combo with the amount of the nutrients mixed in? should I get it down to 5.8 and add more water to lower the ppm's then! which brings me to another question? adding down or up if needed because of ph embalance or say going to low with down then adding up solution! you know the down or up solution added in does that hurt things any or won't?
Yes just add some water to dilute the resovoir. adjust the resovoir PH if needed. only adjust the PH until everything is mixed.
you will always have residual water in the pots and lines....that cant be helped...I call it the fudge factor.
dont get to crazy...the system is quite flexible