hey there OuterBanks, you're alright all the way up to 400-600 PPM, but if it aint broke dont fix it (and double check your ppm meter is not broken and correctly calibrated) . My advice is dont be like these noobs that " flush " in hydro , you dont need to flush more than a day before the chop, that's actually one of the reasons why i like it : you get real precise with the flush . Hope this helps ! 🚀