You should always be adjusting down in a DWC. Rising ph is a
by product of feeding.Rockwool can be tricky to maintain in a DWC
youre better off with Hydroton.Iuse rockwool pretreated down
but it never stays down .Eventually my rockwool steadies out and
a slight adjustment a couple three times a dayis all thats needed.
Good luck ! DWC is very easy after you get it .:hippy: