Well we're not talking about NaOH (lye), but sodium carbonate is often found to be a poor substitute for lye. Assuming SWIY meant Ca(OH)2 (lime):
Sodium carbonate is generally considered to not be strong enough to help break down plant material, but with cebil having such a high percentage of actives and with such a soft and easy to pulverize structure, it is ideal for drytek extraction using sodium carbonate. Not to say it doesn't work, but the texture and absorbancy of material mixed well with lime makes it ideal for this sort of use with an NPS like limonene. Lime is also a stronger base, despite not being incredibly soluble in water. SWIM only uses sodium carbonate in conversion from fumarate to freebase.
Or perhaps SWIY means sodium carbonate in place of lye, rather than lime in place of lye? The same as above still pertains, but it's important to mention that neither can directly replace the use of lye. To be used effectively, household bases are not used in solution as with lye.
Sodium carbonate is generally considered to not be strong enough to help break down plant material, but with cebil having such a high percentage of actives and with such a soft and easy to pulverize structure, it is ideal for drytek extraction using sodium carbonate. Not to say it doesn't work, but the texture and absorbancy of material mixed well with lime makes it ideal for this sort of use with an NPS like limonene. Lime is also a stronger base, despite not being incredibly soluble in water. SWIM only uses sodium carbonate in conversion from fumarate to freebase.
Or perhaps SWIY means sodium carbonate in place of lye, rather than lime in place of lye? The same as above still pertains, but it's important to mention that neither can directly replace the use of lye. To be used effectively, household bases are not used in solution as with lye.