i run dwc at mid 70's.. changing res every week with fresh brewed tea and i NEVER clean my equipment and its been near 2 years with all the same equipment... tea keeps everything healthy. I brew my tea like so: 2 gallons RO water, a dash of mycogrow soluble powder, a nice pinch of sucanat (dehydrated molasses) then bubble for anywhere from 12-48 hours depending on when i get around to doing the res change.
I'm using maxigrow powder and dutch masters gold silica only as my nutrient line.
I'm using maxigrow powder and dutch masters gold silica only as my nutrient line.