Colloids in Daisy is can be simulated using the chemistry framework, with a pseudo-chemical representing colloids in the solute, and two pseudo-reactions, generation of colloids and filtration of colloids. Both reaction models are implemented according to Modelling particle mobilization and leaching in macroporous soil, by Jarvis, 1999.

The file test-colloids.dai in the sample directory contains a sample setup file with colloids. To include colloids in Daisy, add colloids to the Chemistry parameter in the default column model. 

(Chemistry original(combine &old colloids))

The generic log parameterizations Field chemical, Soil Chemical and Chemical Content are useful for keeping track of the two pseudo-chemical. The specialized Colloids log parameterization will give additional information about the generation of colloids.