Soda lime: 94% calcium hydroxide, 5% sodium hydroxide, small amount of potassium hydroxide.
pH13.5 moisture 14-19%
silica, dye
newer : zeolite
pink to white or
white to violet
colour changes when pH <10
1L absorb 120L of CO2
CO2 absorbed-->water and heat produced (exothermic)
adult CO2 production:250ml/min
compound A from sevo+sodalime
CIRCLE system
high FGF of several litres to denitrogenate circle and FRC (only if nitrous is used)
can later reduce to 0.5-1L/min
short period of high flows needed to prime patient and circle
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