Quick Answer
Bubble hash is made with ice water, agitation, and a stack of micron filter bags. Cold water makes trichome heads brittle. Agitation breaks them off the plant material. The bags catch the heads by size. The result is a resin powder that dries and presses into hash. A home batch takes 2 to 4 hours of work plus 24 to 72 hours of drying.
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What You Need
- Cannabis: dried trim, dried flower, or fresh frozen flower. Fresh frozen material holds more terpenes.
- Two 5-gallon buckets.
- Micron bag set: 220, 160, 120, 90, 73, 45, and 25 micron.
- Ice: 4 to 8 pounds per batch.
- Water at 32 to 40 degrees F (0 to 4 C).
- Spoon or plastic card for collecting resin.
- Parchment paper or cardboard for drying.
- Gloves and freezer space.
Step 1: Prep the Material
Use 100 to 300 grams of dried trim or 50 to 150 grams of dried flower per 5-gallon run. Break large pieces by hand. Do not grind. A grinder pushes plant matter through the screens and adds chlorophyll. Freeze the material for 24 hours before the wash. Keep fresh frozen material at 0 F (-18 C) until it goes into the bucket.
Step 2: Build the Bucket
Line one bucket with the bag stack. Order matters: 220 micron on the outside, then 160, 120, 90, 73, 45, and 25 micron as the innermost bag. Fill the bucket with water and add 2 to 4 pounds of ice. Water level should sit above the bag bottoms. Wait until the water reads 32 to 40 F.
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Step 3: Wash and Agitate
Add the cannabis. Stir with a paddle for 5 to 15 minutes. Keep the motion gentle. A drill with a paint mixer works for large runs at low speed. Ice should stay visible in the bucket. After agitation, let the bucket rest for 15 to 30 minutes so the resin sinks.
Step 4: Pull the Bags
Lift the bag stack one bag at a time. Start with the 220 micron work bag. Drain it. Then pull 160, 120, 90, 73, 45, and 25. Resin collects on the screen of each bag. Scoop it with a cold spoon or a plastic card. Keep each micron fraction separate. The 73 and 90 micron screens hold the top grade resin for most cultivars.
Step 5: Repeat the Wash
Run 2 to 4 washes on the same material. The first wash holds the most resin and the cleanest heads. Later washes pick up more plant matter. Stop when the water runs clear or the resin turns green.
Step 6: Dry the Resin
Spread each fraction on parchment or cardboard in a thin layer. Dry in a dark room at 60 to 70 F with 40 to 50 percent humidity. A cardboard sheet pulls moisture faster than parchment. Check at 24 hours. Most batches need 48 to 72 hours. Resin is dry when it crumbles and does not stick to a glove. Mold grows on resin stored wet.
Step 7: Press and Store
Press dried resin with a hash press, a rolling pin over parchment, or a warm glass jar. Heat at 90 to 110 F helps the powder bind. Store in an airtight glass jar in a cool, dark place. Refrigerate for long storage. Frozen storage keeps terpenes, but thaw the jar before opening to stop condensation.
Yield
Expect 5 to 15 percent return by weight from dried trim. Dried flower runs higher at 10 to 25 percent. Fresh frozen material yields less dry weight because of water content.
Common Problems
- Green hash: too much agitation, too long a wash, or a grinder.
- Low yield: warm water, melted ice, or too little material.
- Mold: resin dried in a thick layer or stored before full drying.
- Clogged screens: resin pushed through with force. Rinse bags in cold water and let them air dry.
Legal Note
Home hash making is legal only where cannabis is legal. Rules on extraction and quantity differ by state and country. Check local law before starting.