[APD] Re: RUGF versus UGF

["Tom Wood" <tomwood2 at flash_net>]

TB: "I used 1/2" CPVC, it's smaller than PVC. I made a grid, like 
a giant spray bar and drilled holes in it. If I ran the water in 
normal UG fashion, the sand/detritus etc will be pulled into 
these small holes and also clog the avbove layers, causing 
pockets of high flow, inconsistent distribution etc. By using 
Reverse flow, this eliminates these issues and I can use any size 
sand and have fairly consistent flow at higher flow rates, the 
water is prefiltered before being moved into the grid. ::snip:: 
No need for plastic insect screen also and allows more space for 
roots(all the way to the very bottom of the gravel and around the 
pipes). ::snip::"

I used the regular 1/2" PVC and made an elongated 'H' shape 
turned sideways at the bottom of my 90 gallon. The legs of the 
'H' are drilled with two rows of 5/16" holes at 90 degrees to 
each other, turned toward the bottom of the tank. The plastic 
insect screen molds tight to the pipe and keeps 1-3mm blasting 
grit out. I used a cross fitting at the intersections of the 'H' 
and did a double return back to the pump to hopefully even out 
the flow. I'm using it for mechanical filtering since there is no 
other filter on the tank, so RUGF would contradict the purpose in 
this case. Like I said, just curious.

TW



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