Depends on the feeding schedule of the nutes your using, with the ones i use (Foxfarms) it requires 6 rez changes in a 13 week period, but during those times you will still need to monitor your water and get your ppms where they need to be by adding nutes and/or fresh water to your rez.how often do you have to change nutes in dwc?
I agree! I have only grown mothers in a top drip before (just started my first dwc) but they always turn out fine! the only thing I use my ppm meter for now is to make sure my r/o filter is working 100% and thats not that often! I tested the ph 5 times over the 6 months i kept that first hydro mother and only had to add ph down when I changed the solution. So once you learn the right solution if you change your solution often enough I don't see the need for them! I have talked to so many different people and they all run their ppms way different! The owner of the local hydro shop runs his ppm at 400 all the way through flowering and grows beautiful plants while a buddy has his at 1100-1300ppm. I am using the same solution I use for vegging my mother for my dwc grow, so I still haven't pulled out the meter! I pretty much follow the directions on the bottle as to how much to give her! has worked great for a LONG time now!I have a spare duplicate tub they just sit in while filling up. If i'm organised i have an airstone water and feed already in the tub so i simply pull out the empty one, lift the lid with plants onto the full one and pop that back in.
And for me DWC really is as simple as a bucket of water. I don't mess about with continually monitering ph and ppm, don't even know what my ppm is or should be, used the meter twice and chucked it in the back of the drawer. Growing is as complicated as you want to make it for yourself, other than if you live in an oven or a freezer.
Yeah, my whole pulling the tote in and out, it works, but i'd kill for the place to get something like that going. Ideallys i'd like a real setup, the type with a main reservoir and then the pots are all hooked up with hose. Means you can use smaller buckets for more varieties of plants, without having them drinking them dry every day. I've once tried a plant in a 10L tub, must have held about 5L of water by the time the roots were done, that neede re-filling every 3 days or so. But for now, i just make do as i do as there's plenty of time yet for bigger better thingsThe most efficient DWC growers have a spigot attached to the buckets so that the plants never actually have to be removed from their spot or incur damage. You can drain the bucket through the spigot and refill it the same way or a hole on the top of the bucket.
Plants are usually held in net pots in hydroton in a hole cut in the lid.