may I launch a maybe revolutionary idea I have been brooding on for some time?
based on CHIFT PIST and flout
http://www.rissyplastics.com/flout/index.htmlclick on "view dosing cycle" to see how it works
more pics:
http://midstateconcrete.com/index.php?p ... uct_id=114say you would have some spare level in your fish tank
and you would locate a "flout" in that spare level in a cage
with a pipe to the bottom of the FT to suck the settled solids from the bottom.
run the pump continuously (no priming issues, constant aeration of the fish tank by the pump's flow)
water level in the tank rises until the "flout" kicks in
the "flout" Fast Fills your growbeds
the growbeds Slow Drain into the sump
FFSD is achieved
the cage stops the "flout" from dropping past horizontal level so it kicks out
leaves you with CHIFT from there on.
no risk of draining the fish tank below this level
the pump running continuously slowly raises the level back to where the "flout" kicks in
the sequence starts again
this would mean you need a (much) smaller pump
as it must be smaller than the slow drain lest the "float" kicks back in before drain is completed
the greater the difference, the lesser the frequency of Fast Floods
... or am I missing something?
(sh**, I should have patented this idea and become filthy rich

)
comments please
frank
PS GIVE ME SOME TIME TO MAKE A DRAWING