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riser pressure follow up question



hi all .. this is in line with this riser pressure discussion ..
3 questions :

1.  what flow rate is optimum .. in gal/hr or gal/min
    is ideal for gravel circulation ??

2.  would it act like a heating cable ?

3.  if i plug the riser tube up and put a air hose thru it
    attach this to the venturi tube of a powerhead ..
    would the flow rate be enough ??

HOPE YOU GUYS RESPOND TO THIS >> ITS A GOOD THREAD >>

TIA

MIKE 
its nearly july and its still pushing 41 degs .. oooh hot !!