OK, so i have a basic setup in mind. It consists of 4 kitty litter boxes that will each contain rockwool slabs. On top of these there will be rockwool cubes. I have heard that emptying and rinsing the resevoirs every ~ 2 weeks or so is recommended. I am not sure the best way to accomplish emptying and rinsing in this setup. Would a set up with kitty litter boxes inside a bigger common resevior with a pump and drip tubes/hoses be more practical and easier to flush every couple of weeks?