77a8cecc_Reefkeeping_Acronyms__STANDS_FOR
[ACRONYM] RUGF [WHAT IT IS] Filter system where ater is pumped down through the "uplift" tubes and then rises up through the gravel. The water is mechanically pre-filtered before it is pumped. [STANDS FOR] 
Reverse Under Gravel Filter
Reefkeeping Acronyms
STANDS FOR