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PostPosted: Nov 12th, '15, 22:20 
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Bordering on Legend
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In a constant flow system it seems to be the rule that the water level is kept 2 inches lower than the gravel level so as to provide a place for the roots to grow and not be water logged.

In a F&D System using bell-siphons, would it still be necessary for the two inches of gravel above the water level?
Or, would one be able to flood to the top of the gravel in the GB and when the bed drains the plant roots would get enough air to grown well?

Please explain. Thank you.


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PostPosted: Nov 13th, '15, 06:25 
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I stand to be corrected but, the 50mm odd of dry media in ALL systems, is more to prevent the surface media from being wetted, and thus turning manky and green... IMHO
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PostPosted: Nov 13th, '15, 06:41 
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nah the most important reason for the dry gravel up top is to stop root rot / collar rot and other diseases of the stem because of it being saturated all of the time.


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PostPosted: Nov 13th, '15, 09:05 
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Yeah, nothing to really do with air, plenty of dissolved oxygen within the water for the roots. And keep the level down for both reasons Yav and BD mentioned.

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PostPosted: Nov 13th, '15, 09:49 
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+1 to stem rot and algae etc....

also you get excessive evaporation and water loss when water is at the surface.

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PostPosted: Nov 13th, '15, 13:02 
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Bordering on Legend
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Thank you very much. Now I understand.


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