Blazed, your hannah pen will be very useful in your grow. You also need a pH pen though if you didn't already know that. I grow in an ebb and flow system that is 24gal max reservoir capacity and about 20gal tray so this is very similar to what you are working with.

Like someone said, you want to be able to flood your plants' roots (or where they will be) without the pump pumping more water than your drain hole can drain (otherwise you will have overflow of the worst variety). Loc is dead on, start with 4 hours gap between floods and keep the flood for 10 mins at a time. Increase as the plants get bigger and as you get into flowering, but the first sign of the plants sagging you should cut back on watering periods.

Unfortunately for your first time with the system you might just have to get some sort of measuring method and actually measure out how much H20 you are putting into the system. Be it with 5 gallon water tanks or individual gallons.
deftdrummer Reviewed by deftdrummer on . Nutrient Help Hello, I need a little assistance in setting up my nutrients in my new flood and drain. Im using Botanicare Pure Blend Pro Grow and the Bloom(soil formula cause its better im told). I have a 20 gallon reservoir. How many gallons of water should I add to the reservoir to feed 6 to 8 plants? The seeds are in day 4 in jiffy pellets at the moment but will be going to 5.5in net pots with hydroton rocks as the medium. My flood tray is 2 x 2 x 5in deep. I will be adding nutrients based Rating: 5