Water hash—often called bubble hash—is a cannabis concentrate made by separating resin-bearing trichomes from plant material using ice water, movement and filter bags. The collected material can vary considerably in texture and composition depending on the source material and screens.
How water hash works
Cannabis flowers and leaves carry trichomes: tiny structures that include resin glands. Cold water and mechanical movement help detach some of these particles. A series of filter bags then sorts what passes through by particle size. Water and ice aid the separation; the water is not a chemical solvent extracting dissolved cannabinoids.
Three things happening at once
Cold water
Chilled water changes how the plant material and resin glands respond to movement.
Separation
Movement dislodges some trichome heads alongside other small plant particles.
Mesh bags
Layered screens collect different particle-size fractions rather than one uniform product.
Why do micron sizes matter?
A micron is one-thousandth of a millimeter (0.001 mm). Filter bags use different opening sizes to retain or pass material. Smaller openings do not automatically mean greater purity or potency: starting material, technique and the particles present all affect the final result.
Starting material
Resin content, plant condition and unwanted debris affect what is available to collect.
Separation and drying
Trapped plant particles and residual moisture can compromise the final material. Clean handling and thorough drying matter.
Is water hash the same as dry ice kief?
No. Both use physical methods to separate trichomes, but water hash uses an ice-water mixture with filtration bags, while dry ice kief uses solid carbon dioxide and dry screening. Each method produces different particle fractions and handling considerations.