[jmystro]

What does your media consist of? Not watering to run off is how you get salt build up which causes pH to swing out of range. Plants consume far more water than minerals. Salts form as minerals concentrate during dry backs. Proper run off insures excess minerals and salts get washed out between waterings. 10-20% run off is what you want when watering in from the top. You can’t easily over-saturate a media when top feeding an established plant. Young seedlings and clones need a little break between waterings when their delicate roots are not established in a container.