Glossary: R

Reflector

Something having a polished surface for reflecting light. Reflectors are placed around aquarium lights to guide and direct their light downward.

Reverse Osmosis

This is a purification method for tap-water. Prefiltered tap water is pushed through a reverse osmosis membrane. Water that makes it through is considered pure, while water that does not, is sent through a special tube and is rendered impure. As it relies on water which is able to pass through the membrane, it also generates a large quantity of "waste" water which cannot be used. This is one of the best, but slowest methods of tap water purification. Reverse Osmosis units produce purified water at extremely slow rates, sometimes as low as 10 or 15 gallons per day (depending on your water pressure and temperature).

RO

See Reverse Osmosis

RO/DI

Reverse osmosis with deionization. DI filtration alone is highly effective at purification, but the filter media exausts quickly. By adding it to the end of a reverse osmosis filter, near 100 percent purity can be acheived, while extending the life of the DI resin.

ROFL

Rolling on the floor laughing (forum lingo)

RTN

Rapid Tissue Necrosis

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