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**Freef** · 18th April 2008, 21:36

It depends if you are shallow or deep diving as well, and how scared the fish get if that's what you are trying to see.

In the shallows [12m or less] it's recommended that you dive with it fully open, in the depths [12m+] closed to suit the diver.

As the first stage is nin compensating, you are adding the same surface ammount of gas per minute. At the surface on the 60% jet you will add 5.8L to the loop, at 30m this will be 1.45L because of the compression factor. So at depth the Dolph will dump less.

You can also push your shoulders forwards as you exhale to dump a bit more gas ig you need to.

Personally, I dive with the dump fully closed, most of my dives are below 20m.

18th April 2008, 21:36	#4 (permalink)
Freef Custom Title Disallowed! Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Jan 2006 Location: Land of the Freef, UK. Posts: 1,356	Re: overpressure valve It depends if you are shallow or deep diving as well, and how scared the fish get if that's what you are trying to see. In the shallows [12m or less] it's recommended that you dive with it fully open, in the depths [12m+] closed to suit the diver. As the first stage is nin compensating, you are adding the same surface ammount of gas per minute. At the surface on the 60% jet you will add 5.8L to the loop, at 30m this will be 1.45L because of the compression factor. So at depth the Dolph will dump less. You can also push your shoulders forwards as you exhale to dump a bit more gas ig you need to. Personally, I dive with the dump fully closed, most of my dives are below 20m. __________________ David. Currently owner of two differently sized ankles.
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