imho dont add nutwes to your res say half way through a week, you set your ppm to a certain level and leave it all week, 1 day a week change the nutes out with fresh ones and repeat, add fresh phed water to teh rez throughout the week to keep water levels up.

the reason for this is your plant might have only used some of the nutes but alot of the water if you add nutes your goin to hurt the plant if they get too high

rule of thumb

mix nuts on sundayadd phed water all week change nutes out on sunday again.

another way to do it is mix your nutes on sunday, then fill a bucket up with the same amount of phed water. (your rez is 2 gal mix 2g of nutes up then have a seperate bucket of plain 2g of phed water) add the water from the bucket to the rez throught the week. oncwe the bucket is empty change your nutes in your rez.

you never want to dilute the nutes more than teh rez capacity i.e if your rez is 2g dont add 4g of phed water to it all week then change out the nutes

lost yet?