Quote Originally Posted by macnasty
Beautiful setup. Everything is so clean and nicely assembled.

Like I said I love your setup. How does that bucket outside the tent work? How do you change your rez?
Thanks for the kind words.

The main reservoir is higher than the auxiliary reservoir. I have two outlets on the main reservoir.
One is at the height where I want the water level to be. The other one is at the bottom with a shutoff valve attached.
When running the system I keep the bottom valve closed. The nutrient solution is pumped into the reservoir until it fills up, and then it starts recirculating back to my lower res.

I also have two shutoff valves at the pump. One goes to the main reservoir, and the other to an open hose. In normal operation the open hose valve is closed and the reservoir valve is open.

When I want to change the nutrient solution, I first shut the valve to the reservoir at the pump. Open the valve to the hose.(This hose is put into a bucket.) Last I open the valve at the bottom of the main reservoir.
The higher res drains down to the lower res, and is pumped out to my extra bucket.
Then it's just a matter of dumping that bucket down the drain.

I hope that makes sense........