Glossary of Aquarium Filtration Terms

• AC - Activated Carbon
• BB - Bare Bottom
• CC - Crushed Coral
• DI - Deionization
• DSB - Deep Sand Bed
• FO - Fish Only
• FOWLR - Fish Only With Live rock
• FW - Freshwater
• GAC - Granular Activated Carbon
• GFO - Granular Ferric Oxide
• GPH - Gallons per Hour
• GPM - Gallons per Minute
• HOB - Hang On Back
• LPH - Liters per Hour
• LR - Live Rock
• LS - Live Sand
• NH2 - Ammonia
• NO2 - Nitrite
• NO3 - Nitrate
• PO4 - Phosphate
• PS - Protein Skimmer
• RO - Reverse Osmosis
• RO/DI - Reverse Osmosis/Deionization
• SG - Specific Gravity
• SW - Saltwater
• TDS - Total Dissolved Solids
• UGF - Undergravel Filter