The following was taken off another site. Thank Mutt.
Water Cure
Unlike other curing methods, the water cure is performed after the marijuana is dried. Powder and small pieces are most often used, but the cure also works with whole colas. The material is piled loosely in a glass or ceramic pot which is filled with luke-warm water. (When hot water is used, some of the THC is released in oils, which escape and float to the top of the water.) Within a few hours many of the non-psychoactive water-soluble substances dissolve. An occasional gentle stirring speeds the process. The water is changed and the process repeated. Then the grass is dried again for smoking.
THC is not water-soluble; so it remains on the plant when it is soaked. By eliminating water-soluble substances (pigments, proteins, sugars, and some resins), which may make up 25 percent of the plant material by weight, this cure may increase the concentration of THC by up to a third.
Marijuana cured by this method has a dark, almost black colour, and looks twisted and curled, something like tea leaves. The water cure is frequently used to cure dried fan leaves and poor-quality grass.
Step 1 - Chop your buds and allow to dry fully
Step 2 - Place buds in water and add weight so they come to rest underwater (I do not believe a ratio of bud to water has ever been established)
Step 3- After 24 hours take PPM reading and change out water
Step 4- Take PPM reading after 12 hours. If the increase more then 500 change out the water.
Repeat steps 3 and 4 until the change in PPM is less then 150.
Step 5 - remove the buds and hang to dry
Step 6 - Watch the buds carefully because they will dry faster
Step 7 - Buds should have that long cure effect when smoked, without the long cure.