I'm doing my first dwc and its a simple 5 gallon bucket with a plastic pot in lid and an air stone in the bottom. I change nutes weekly. It is super easy! I didn't have a ph or ppm pen but she has not shown any problems. I just dilute one capful of vinegar to each gallon of water. Some will say it can cause build ups in the water but I haven't had them and she's growing like crazy. I use fox farm grow big, big bloom and tigger bloom and about 1/2 strength. If using tap water then let it sit out for at least 24 hours to help dissolve chlorine. I did buy a water tester and am waiting on its delivery but I'm about 5 days into flower and have not ran one test on my ph or ppm. Just go simple like I've done in order to get a feel for the system and its tendencies. Some people will recommend topping off your dwc when its empty but that's almost impossible if you don't have a ppm meter so change once a week is great. Start the nutes weak the first week and slowly raise each feeding after that until you've reached full strength or the plant shows problems. If your electricity is reliable then this really is a great system for someone that can't work in the garden daily. Try it on a smaller scale and see how it fits your liking before setting up an entire grow. Good luck!