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BOD – Biological oxygen demand

BP – Barrelponics (see System Glossary)

CF – Compact fluoro

CF – Continuous Flow (see System Glossary)

CHIFT PIST – Constant Height In Fish Tank, Pump In Sump Tank

DFT – Deep Flow Technique (see System Glossary)

DI – Deionisation

DO – Dissolved oxygen

DOC – Dissolved organic compounds

DWC – Deep water culture (see System Glossary) also DFT – Deep Flow Technique

E&F – Ebb and flow (see System Glossary)

F&D – Flood and drain (see System Glossary)

FRC – Floating raft culture (see System Glossary)

FT – Fish Tank

GB – Grow beds (see System Glossary )

GH – General Hardness, caused by divalent metal ions, primarily calcium and magnesium. (see Water Hardness and Fish Health )

GH – Green house

HPS – High pressure sodium lighting

IBC – Industrial / International / Intermediate bulk container (see Hardware Glossary)

KH – Carbonate Hardness, due to carbonate / bicarbonate ions, and represents the main ‘buffering capacity’ of the water, i.e. its ability to resist pH changes. (see Water Hardness and Fish Health)

LC50 – Lethal Concentration 50 usually used for gases in air or in the case of fish concentration in water in ppm. The 50 represents a 50% mortality in test subjects.

LD50 – Lethal Dose 50 at which 50% of the test subjects died. Is usually stated in mg/kg body weight.

Meg/L – Millequivalents per litre

MH – Metal Halide lighting

NC – Normally Closed (refers to relay contacts) contacts closed when relay has no power applied to relay coil (eg 240v), opens when power on

NFT – Nutrient Film Technique (see System Glossary)

NH3 – Ammonia (see The Nitrogen Cycle & Nitrifying Bacteria Facts for a full description)

(And Ammonia – The Silent Killer )

NH4 – Ammonium, the ionized form of ammonia, which is occurs when the water is acidic. It is not as toxic to fish as ammonia, which is why aquariums that have acidic water do not have as many problems with the initial phase of the nitrogen cycle. Ammonium, the most important nitrogenous fertilizer for water plants, is essential for the breakdown of plant protein.

NO – Normal Output (refers to lighting)

NO – Normallly Open (refers to relay contacts) contacts open when relay has no power applied to relay coil (eg 240V), closes when power on

NO2 – Nitrite (see Nitrite and Fish Health for a full description)

NO3 – Nitrate (see Nitrite and Fish Health for a full description)

PC – Power Compact Lights

pH – acidity or alkalinity of a substance (see Fish Health and pH )

ppm – Parts per million

ppt – Parts per thousand (i.e. one gram per 1000g or 1Kg per 1000L)

RAS – Recirculating Aquaculture System

RFF – Radial Flow Filter

RO – Reverse Osmosis

RSG – Really Smart Guy filter, discussed here

SG – Specific Gravity, meaning the salinity (salt) content of your water.

SHO – Super High Output (refers to lighting)

SLO – Solids Lift Overflow

SOG – Sequentially Operated Growbed (contact Ellkaybee for more information)

SUF – Static Upflow Filter

TBPC – Tri-Based Pelletized Carbon

UGF – Under Gravel Filter

UPS – Uninterruptible Power Supply

UV – Ultra Violet

VHO – Very High Output (refers to lighting)

Aquaculture – The controlled cultivation and harvest of aquatic plants or animals (eg, edible marine algae, clams, oysters, and salmon).

Aeroponics – a hydroponic technique involving the use of sprayers, nebulizers, foggers, or other devices to create a fine mist of solution to deliver nutrients to plant roots.

Aquaponics – the integration of aquaculture and hydroponics. The reason WHY we are all here

Auto-siphon –

Barrelponics –

CHIFT PIST – Constant Height in Fish Tank, Pump in Sump Tank — One method of running a system to ensure that the fish tank water level won’t fluctuate. Also makes it unlikely that the fish tank will run dry if the pipes break or some other crises occurs. Typically water is pumped from

Blue drum – 200L plastic drum used in many areas of aquaponics. Can be cut in half vertically or horizontally to give two 100L grow beds. Care needs to be taken when obtaining these drums that toxic chemicals have not been stored in them. Depending on the previous use of the drum, they may be successfully cleaned and used in your system.

Crenellations – cover a greater surface area compared to a series of drilled holes and thus lets a greater water flow through, holes are more prone to clog. Think of the tops of mediaeval castles _|-|_|-|

Fish-safe silicone – (from a supplier) a medium modulus, one component, acetic cure silicone recommended specifically for the fabrication and repair of fresh or salt water aquariums. It forms a tough waterproof seal that won’t crack or shrink, and is non-toxic to fish when fully cured after 7 to 14 days. Cure time depends on bead size and cure conditions.

Does not contain fungicides that will kill your fish.

Float switch – an electrical switch used to turn pumps on and off during pumping cycles. The usual configuration in aquaponics has the Switch switching ON when the float is in the UP position…. The switch switches the pump ON when the tank is full and then the pump being switched on will pump to empty the tank. When the float is DOWN, the pump switches OFF.

IBC – Industrial / Intermediate / International Bulk Carriers, 1000L, usually 1000mm x 1000mm x 1000mm (approx.) plastic cubes used to transport bulk liquids by road or rail. They are usually white / translucent and contained within a steel or aluminium cage on a pallet. Care needs to be taken when obtaining these ibc’s that toxic chemicals have not been stored in them. Specialist fittings are often required to couple to the tap in the bottom of the ibc.

Plastic types – some different types of plastic and other pipes and their usages

PVC Pipe

• PVC stands for Polyvinyl Chloride.

• Used for carrying cold water, irrigation, as conduit and for DWV (drain-waste-vent) projects.

• Rated by thickness and strength. Common ratings (thickest to thinnest) are Schedule 40 (most common), Class 315, Class 200 and Class 125 (generally used for irrigation).

• Available in sizes from 1/2” to 2”. White in color


• CPVC stands for Chlorinated Polyvinyl Chloride.

• Used for both hot and cold water supply or chemical distribution systems.

• Good for temperatures at 200° F in pressure systems and non-pressure systems.

• Requires special solvent cement that is different from cement used for other types of plastic solvents. Most solvents will indicate this on the can.

ABS Pipe

• Means Acrylonitrile Butadiene Styrene.

• Made from a thermoplastic resin. Lightweight and easier to use than metal pipe.

• Commonly used for DWV (drain-waste-vent) applications or for underground electrical conduits.

• Available as either solid wall or cellular core construction

Black Poly Pipe

• Used for carrying low-pressure cold water. Common applications include golf course sprinklers, underground conduits or to carry corrosive liquids and gases.

• Good chemical and crush resistance.

• Lightweight enough to cut with an ordinary knife or a fine-toothed hacksaw blade.

PEX Pipe

• PEX stands for crosslinked polyethylene.

• Chief advantage is its flexibility and strength. It can make turns around corners without couplings.

• In a PEX plumbing system, a separate line is run from the main water supply to each fixture in a set up much like a circuit breaker box.

• Used for carrying hot and cold water.

• Excellent chemical resistance to acids and alkalis, but do not use for fuel oil, gasoline or kerosene systems.

• Do not weld with solvents. Join with heat fusion, flare, crimp ring or compression fittings.

Galvanized Pipe

• Has zinc coating that prevents rust if not scratched.

• Use primarily for carrying water or waste. Do not use for gas or steam.

• Common water sizes are 3/8”, 1/2”, 3/4” and 1”. Common waste sizes are 1-1/2”, 2” and 3”.

• Often sold in pre-threaded standard lengths, or can be custom threaded.

• Use only wit

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