Rick ' s automotive . They are good . <| sep |> I don ' t have a pH pen . I use the drops . My water starts off at ~ 7 . 0 after I add the nutrients and mix . I ' ll adjust to ~ 6 . 0 then recheck after a couple hours . By then , it ' ll have jumped back up to ~ 7 . 0 . I readjust , then have to repeat once more before it stabilizes to ~ 6 . 0 . Edit The reservoir has been at ~ 6 . 0 since I changed it on 1119 . well , after I was able to stabilize it . <| sep |> I remember how that felt . It gets so much easier the more you accept yourself and embrace the things you enjoy . <| sep |> If you care about sag , you ' re gonna regret being lil miss bra burner independent . Old woman I cared for warned me , but I ' m flat chested so the risk doesn ' t exist .