edwants2dive
Glowstick
I recently moved and am using a new shop to get fills. The partial pressure blend for Nitrox. Somehow in the discussion about the mix I wanted they revealed that they drain the tank before filling. They start with the O2 then add the air to get the mix. They reasoned that the O2 mixes better that way. Most shops I know that partial pressure blend use a calculator to find the amount of O2 and air to add to achieve the desired mix then add the O2 and top with air. Just wondering if that could be allowing humid air into my tank and cause problems at vis time.