During the dive, the following checks must be carried out at least every ten minutes or if a suspected malfunction in the IS-MIX occurs.

Pressure - Check the pressure.

By-pass - Check the function of the by-pass valve by gently pushing it and hearing that it works.

Reserve gas valve - Check that the reserve gas valve is in pressed-in position. Pull out and reset.

Readjustment of the mask strap - Some neoprene hoods are compressed with increasing diving depth. When these hoods are used, you must continue to adjust the head straps during the dive.

TIP: After rapid descents to a maximum depth, incorrect warning due to low bellows can be prevented by performing a short and sharp by-pass.