so more you read/post/ask ppm becoming rocket science lol , i simply dont add/deduct shit. Im trying to keep it simple.So are you just including the ppm of your tap water into the total ppm as a base and not adding any calmag?
How exactly are you working the figurative number for feed?
I think of ppm as a calorie less is more but if u get more calories from tomato is not the same as u get same amount form cookies so adding calmag with filtered tap wont hurt but adding big bud and koolbloom at the same time probably will.
i use 75% of everything based on feed chart or bottle label. i use gh flora 3 part (75 % feed chart) botanicare calmag (75 % of 3ml per gall cuz i already have calmag in my water) , protect silica 75 % of 5ml per gall ,hydroguard full dose , root exc full dose. but i make 100 gall nutes and my system is 120 gall, so if i see nut burn i just add water to lower the ppm since i dont use top off right now. but if u add ro top off with floating valve ur chances of overfeeding get really low since as soon as they drink/eat u will add almost 0 ppm water back(i dont top off so i can force feed plants).
now this run im trying House and Garden entire line with 100% strength it spouse to be made specifically for DWC , and their support told me that with 100 % strength some strains might require me to got 110 % ill see how it goes