K2 Xtreme AltoMixer | Reach Lower Oxygen ValuesFor advanced AltoLab users who have difficulty in dropping their blood O2 levels. Drop blood oxygen into the 70 80% range for proper IHT exposure. The K2 Xtreme AltoMixer is an accessory to the AltoMixer Triple Stack. Advanced AltoLab users occasionally reach a limit with the conventional AltoMixer stack, sometimes needing as many as 10 AltoMixer cups to lower their blood oxygen into the 70 80% range for proper IHT exposure. This unit is attached to