dwc?

[greenthumb]

i have a 10ltr mop bucket with a canna coco sack over it and a airpump in a couple of mess tins to stop it getting wet the air line is attached to a bubble tube.
would i be ok to just keep changing the water every week instead of fuckin about with ppms or would i have to change it more often?
i have a ph pen already so i can keep my eye on ph.
any help would be very helpfull

 

[ENTYC]

I have had success just changing it every week as well as using a ppm meter and topping up ideally you want the roots to drink off some of the water to form the air pocket anyway so you would not really want to top off too much anyway