running about 3 weeks, some trays are 6 months. tied my 2 fish tanks with the koi pond added new trays. I have 2 syphon overflow bottles 1 feeds the trays the other is just a safety valve to prevent over filling of tanks. they are connected by a water bridge. the 2 liter bottle controls the water level in both fish tanks. looks bad now but now that it works i can improve it. experiment learn change grow...