CCR

Rebreather

I teach the CCR courses on these three rebreathers.

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S7

Modular manual CCR (mCCR)

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Very compact, modular and with few parts. Built for travel, caves and tight passages.

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One of the most compact rebreathers around, built as a modular platform that can be dived in different configurations, not just sidemount. Scrubber and counterlung sit side by side, the breathing loop is short and loop volume small. Designed by Andrew Goring (Sump UK), produced by SmartDive in Portugal, with IDF as its training agency. As an mCCR it needs no solenoid: oxygen flows in through constant mass flow (CMF) or a needle valve, set as close to your metabolic rate as possible, and you add the rest by hand with the MAV. That means few parts, few failure points and a deep understanding of the loop. CE certification is planned for 2027.

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T-Reb

Electronic sidemount CCR (eCCR)

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Slim and streamlined, handles like a stage cylinder. Built for caves, mines and ice.

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From Poland, designed by Andrzej Pałucha and built by Other Gravity. According to the manufacturer it carries and handles much like an aluminium 80 cu ft stage. The 2-litre oxygen cylinder sits inside the housing, the diluent is fed from outside. Type-examined to EN 14143 (CE, 2019): to 40 m on nitrox and 100 m on trimix. It is controlled via Shearwater DiveCAN. Slim and streamlined, built for caves, mines and under-ice diving.

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Poseidon Se7en

Electronic backmount CCR (eCCR)

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Automated checks before every dive and automatic PO₂ control. From recreational diving to trimix dives to 100 m.

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From Sweden, on the market since 2012. The Se7en runs automated safety tests and sensor calibrations before every dive and maintains the PO₂ by itself. The head-up display and bailout valve are built into the mouthpiece. Expandable from recreational diving to trimix deco dives to 100 m (CE to EN 14143), with manual gas addition for technical dives. The battery fitted sets the depth and deco limits.

The three rebreathers compared

The key figures at a glance, so you can see how the units differ.

Feature	S7	T-Reb	Poseidon Se7en
Type	mCCR: oxygen flows in via CMF or a needle valve, as close to your metabolic rate as possible; you add the rest by hand with the MAV	eCCR: a solenoid holds the PO₂	eCCR: solenoids hold the PO₂, automated checks
Mounting	Sidemount, carried like a stage; also alongside twins or backmount	Sidemount, clipped to the harness at two points; can also be used with backmount	Backmount; counterlungs over the shoulder or on the back
Certification	CE certification planned for 2027	CE to EN 14143: to 40 m on nitrox, to 100 m on trimix	CE to EN 14143: to 100 m
Size	about as tall as a 2 L and as thick as a 3 L cylinder	no bigger than an 80 cu ft aluminium cylinder	–
Weight	about 5 kg	16.5 kg without absorbent	from 18 kg ready to dive, from 9 kg travel weight
Scrubber	axial, 1.9 kg	radial, 2.5 kg	axial, up to 2.5 kg
Scrubber duration (manufacturer)	up to 4 h, depending on the dive	180 min per the manual	about 180 min
Counterlung	one, 5.4 L, between chest and side	two of 2.3 L, inside the housing	two, over the shoulder or on the back
Cylinders	variable, mainly off-board	oxygen 2 L inside the housing, diluent fed from outside	two 3 L cylinders for oxygen and diluent
Electronics	no controller in the unit; 3 sensors, read out on Shearwater or Halcyon	Shearwater DiveCAN with Petrel 3 or NERD 2, 3 sensors	M28 computer, 2 sensors (3rd optional), checks before and during the dive
Mouthpiece	DSV	DSV	BOV with HUD
Power	no battery in the unit	AAA lithium battery	Li-ion battery, up to 30 h
Water temperature	4 to 34 °C	4 to 34 °C	4 to 35 °C
Travel	fits in half a cabin suitcase	splits into four modules	can go as carry-on, from 9 kg
Origin	designed in England (Andrew Goring), made in Portugal	Poland, designed by Andrzej Pałucha	Sweden, since 2012

Manufacturer figures and practical values as of October 2026 (s7ccr.com, othergravity.com, poseidon.com). The scrubber durations were determined under different conditions and are not directly comparable. The manufacturers do not publish exact dimensions. Which unit suits your diving is something we can discuss in person.

Try it first: CCR try dive

One supervised 40-minute dive on one of the three rebreathers, with no course and no certification. You find out what a rebreather feels like before you decide. CHF 250.–

Rent a rebreather

No unit of your own? For the CCR courses you can rent one of the three rebreathers: CHF 200.– per dive.

Buy your rebreather from me

You can buy all three rebreathers from me. Prices on request; they usually match the manufacturer's recommended retail price plus VAT, customs and shipping.