Can I get some more info of that system.
how many gallons per day?
For 214 bucks i'm considering a few
Gpd would basically be set by the timer and how often you ran it. They are also dependent on the type of filters in the housings. These filters that will be included with this system will give a person more gpd than they will ever need. If a person was to put in some cheaper filters your gallons per day and filter life would be greatly reduced.
Also for people with wet/drys getting this system this would be a great oppertunity for you to incorporate a flood and drain system with this so your biomedia could recieve full coverage instead of just the channeled area