Aquatechnic Pte Ltd

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Dupla Products & Systems (Germany)

CO2 System

Tropical waters, especially flowing waters, exhibit a surprising degree of stability, independent of the season, water level and light conditions. Factors such as pH value, CO2 content, degree of hardness etc. show only a slight fluctuation in range. Therefore, stability of all parameters is of great importance for the aquarium as well. The Dupla CO2 system ensures stability in the aquarium:

Constant pH value.

In the optimum community aquarium where tropical fish from geographically and chemically differing waters can be cared for, a neutral pH value is recommended.

The CO2 system also offers great advantages for the specialised aqaurium in which special dish species, such as discus fish, can be cared for or bred. Due to the precisely controlled CO2 dosage, both acid and alkaline pH ranges are able to be programed and set so as to be stable.

Stable carbonate hardness.

If an aquarium suffers from CO2 deficiency, the following will occur: Carbon is chemically bound in carbonates. Without sufficient 2 the plants need this bound carbon. Through the process of biogenic decalcification, the carbonates are broken down, the carbonate hardness drops to dangerously low values, and the pH value becomes extremely unstable. With sufficient CO2 supply however, the plants utilise the carbon contained in the carbon dioxide. Biogenic decalcification no longer occurs and water stability is assured.

Optimum carbon supply for plants.

Submerged water plants obtain their carbon requirements preferably from dissolved gaseous carbon dioxide in the water. With the Dupla CO2 system, optimum carbon supply is provided. Dupla, the pioneer of CO2 fertilisation, offers a wide range of products for both small and large aquariums.

The Dupla CO2 System in detail:

Dupla CO2 Dauertest (visual test)
Dupla CO2 Depot 500g, 750g and 1500g in aluminium
Dupla CO2 Fitting Delta (pressure reducer)
Dupla CO2 Fitting Alpha (pressure reducer)
Dupla CO2 Zerstäuber (atomizer)
Dupla CO2 Reaktor 400 (medium reactor)
Dupla CO2 Reaktor S (large reactor)
Dupla CO2 Magnetventil (solenoid valve)
Duplasafe Ventil (non-return valve)
CO2 – Blasenzähler (gas flow indicator)
Dupla pH – Control Alpha (digital controller)
Dupla pH Electrode (glass electrode)
Dupla pH – Set Delta (analogue control set)

Information: The 'Alpha' devices are the premium range products of the Dupla systems. They are designde for the discriminating aquarist and especially suited for use in larger aquaria. For example, the above mentioned pH-Control Alpha, is microprocessor-based and features visual and acoustic alarm indication.

The 'Delta' devices are designed for beginners as well as experienced aquarists. They are suited for aquaria of all sizes. The Dupla pH-Control Delta is a quality, automatic control device.

Item no.	Product	Description
	Dupla Safe Valve	Non-return valve for CO2 and air hoses.
	Dupla CO2 Reaktor 400	CO2 reactor for aquaria up to 400 l.
	Dupla CO2 Fitting Pro	Pressure reducer with fi ne needle valve.
	Dupla CO2 Bubble Counter	Flow control with safety valve.
	Dupla CO2 Reaktor S	CO2 reactor for large for aquaria up to 5,000 l.
	Dupla Depot 500 g	CO2 steel cylinder with fi xing device for wall mounting.
	Dupla Depot 2,000 g	Extra large CO2 steel cylinder with fl at bottom for fi rm upright position.
	Dupla CO2 Atomizer	CO2 atomizer for aquaria up to 200 l.
	Dupla CO2 Set Delta 200	Professional CO2 system for aquaria up to 200 l.
	Dupla CO2 Set Delta 400	Professional CO2 system for aquaria up to 400 l.
	Dupla CO2 Magnetic Valve	Valve for semi- and fully automatic CO2 control.
	Dupla CO2 Set Omega	CO2 fertilising system through natural carbon dioxide source. For for aquaria up to 150 l.
	Dupla CO2 Pack Omega	Refi ll reagents for the reactor of the Dupla CO2 set Omega.

Following is a brief description of the individual Dupla CO2 products:

Dupla-Visual-Test

Qualitative testing of CO2 content in three stages. Blue: too little CO2. Green: correct content. Yellow: too much CO2.
Dupla CO2 Depot

Absolutely safe, pressurized aluminium gas cylinders with safety valve. Depots with contents of CO2 of 350g, 500g, 750g and 1,500g.
Dupla CO2 Armatur Delta

It is supplied with an easy to handle knurled nut for cylinder connection and a precise and easily adjustable flow control needle valve. It can be extended by adding a low pressure gauge and a Magnetic Valve.
Dupla CO2 Armatur Alpha

It features high and low pressure gauges, with working low pressure being factory preset to 1 bar. Precise and easy adjustment is provded by a fine needle valve.
Dupla CO2 Reaktor S

It is perfectly suited for the optimum and nearly maintenance-free CO2 fertilisation in large aquaria. In conjunction with the Dupla CO2 magnetic valve and the control devices Dupla pH-Control Delta or pH-Control Alpha, it forms a fully automatic, intelligent CO2 fertilisation system for aquaria.
Dupla CO2 Reaktor 400

It is suitable for aquaria up to a volume of 400 litres. In the Reaktor 400, water from the filter pump's by-pass, trickles over the internal cascade, mixing with inflowing CO2 gas, thereby creating a large increase in CO2 diffusion capacity.
Dupla pH-Control Delta

A pH control device utilising analogue technology, with digitaldisplay. The adjustment of the set value and calibration, are effected by means of potentiometers.
Dupla pH-control Alpha

It is a mircoprocessor based controlled pH control device with a three segment LED display. The state of the switching unit is indicated by the green LED in the display of the control panel.
Dupla CO2 Magnetventil

The magnetic valve is for semi or fully automatic CO2 control. It has a brass valve body and provides reliable functioning at all times.
Duplasafe-Ventil

is used for safety reasons, should be installed between the magnetic valve and 2 Reactor 400. It prevents water from flowing back into the magnetic valve.
Dupla CO2 - Delta

with a choice of CO2 depot in 350g, 500g, 750g or 1,500g.
Dupla CO2 Set Delta S

is recommended for larger aquaria, roughly up to 400 litres, includes the Dupla Reactor 400, a separate Duplasafe Valve and a choice of larger Depot.
Dupla CO2 – Zerstäuber

This is a small CO2 'reactor' for CO2 fertilisation in small aquaria. The CO2 gas is passed through a fine-porous glass diaphragm and released into the water as a cloud of tiny gas bubbles. The clever physical trick with the atmoizer: the gas bubbles are met by surrounding water movement as they rise, thereby releasing CO2 into the water. CO2 is now available to the plants.

Fully automatic CO2 control system for aquaria up to app. 200 l.

Consisting of Dupla CO2 Depot 500 g,
Dupla CO2 Fitting Pro,
Dupla CO2 Magnetic Valve,
Dupla pH-Control Set Delta including Gel Electrode,
Dupla CO2 Atomizer,
Dupla CO2 Long-term Test.

Fully automatic CO2 control system for aquaria up to app. 400 l.

Consisting of Dupla CO2 Depot 500 g,
Dupla CO2 Fitting Pro,
Dupla CO2 Magnetic Valve,
Dupla pH-Control Set Alpha including Gel Electrode,
Dupla CO2 Bubble Counter,
Dupla CO2 Reactor 400,
Dupla CO2 Long-term Test.

The CO2 table is a good help to ensure an optimal pH adjustment through CO2 fertilisation which leads to an ideal supply of carbon for the plants. However, it also shows that water with a carbonate hardness (CH) below 3 – 4° dH in the neutral pH range has a very low carbon dioxide content. This can quickly lead to a lack of CO2. Therefore, when the CH value drops below 3 – 4°, the pH value should be reduced to 6.4. For the same reason, when the carbonate hardness is below 3.5° dH, the Dupla CO2 test often supposedly gives a wrong reading because other substances affecting the pH value, such as humic acid and high levels of NO3 interfere with the CO2 value.