Hi all ,at what intervals should i flood my system for?

what medium are you using? It depends how fast the medium drains water. Rockwool holds water like a mofo so if you flood too much you'll kill your babies. I use hydroton and flood three times a day for 15 minutes, during the light cycle.

splifman is too right about rockwool holding lots of water. I use 8" plastic pots stuffed with loose rockwool (aka 'floc' or 'granulated' rockwool) in a flood system. I only need to flood once a day for 5 minutes. Small plants (under 2 weeks in the flowering area) need less water. Depending on conditions, I may flood them 1x/day for 1 min or 1x/2 days for 2 mins.

I have the benefit of having 4 flood trays, each with its own tank, pump and timer. Clones go in every 2 weeks and plants ready to harvest come out. This way, each tray contains plants at 0-2 weeks, 2-4 weeks, 4-6 weeks and 6-8 weeks in flowering. The timers can be adjusted for the differing water consumption rates. Plants at 4-6 weeks are thirstiest. This arrangement makes it easier to flush plants with plain water in the last week as well, without altering the diets of all the other plants.

thanks for the info mates... im going to be growing soil, and ill keep one mother and clone and use hydro :P

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I,am using rockwool cubes (4 inch) and flooding it evry 15 mins in the hour?

I'am growing 4 plants.

Are you saying that you are flooding four times an hour? Sorry if this is off. If you are flooding more than once a day, it is probably too much. I am not experienced with rockwool. I suggest you follow somehting similar to what Al B. Fuct described, since he grows using a similar medium.

I,am flooding it 24 times a day,, 1/4 of a hour each time
I forgot to say that they are in veg stage and they are 5 weeks old!

That is to mutch. 3 times a day for 30 min is what i do and i have been doing that ever since i started growing hydro 10 or so years ago. I think that once a day is not enough. Every time you flood your tray you are replacing O2 to the roots.

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So .. are you really saying don't ise rockwool blocks in a flood and drain, that would make sense to me?

Hey vic, who are you asking that question to?

I use rockwool in my flood and drain. I flood 3x a day. Things seem fine to me but I'm not an expert.

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