Bubble hash, also called ice water hash, is one of the oldest and cleanest ways to turn cannabis trim or flower into a concentrate. It uses only ice, water, a set of mesh bags and some patience. No solvents are involved. The cold makes trichome heads brittle so they snap off, the water carries them away from the plant matter and the mesh bags sort them by size. With a bit of practice, home growers can make a clean, sandy resin that can be enjoyed as is or pressed. This guide walks through the full process for adults 21 and older in places where solventless home processing is legal. Rules vary by state, so check yours before you start.

What you need

• A set of mesh filter bags, often called bubble bags, in several micron sizes (see our bubble bag guide, link #350 once live)
• Two clean 5 gallon buckets
• A long, clean stirring paddle or spoon
• Plenty of ice, often 10 to 20 pounds or more per run
• Cold, clean water
• Cannabis trim, small buds or fresh frozen material
• A plastic spoon or spatula for collecting resin
• Parchment paper, a fine screen or cardboard for drying
• A cool, dry room or a freezer with space to dry

Choosing your starting material

The better the material, the better the hash. Use healthy plants with mature trichomes. Dry trim works, but many hash makers prefer fresh frozen material, which is cut at harvest and frozen right away to keep trichome heads intact. See fresh frozen cannabis. Avoid moldy or pest damaged material.

Step by step

1. Chill everything. Put your material in the freezer for several hours. Chill your water, buckets and bags if you can. Cold is the key to clean hash.

2. Line a bucket with bags. Stack your bags in one bucket, finest micron on the bottom and the work bag, the coarse bag that holds plant matter, on top. Fold the edges over the rim.

3. Add ice, material and water. In the second bucket, layer ice and material, then add cold water until it is just covered. Some people put the material inside a work bag in this bucket to keep things tidy.

4. Agitate gently. Stir slowly with the paddle for about 10 to 15 minutes. You want to knock trichomes loose without breaking plant matter into tiny bits. Gentle and steady wins.

5. Let it settle. Give the mix a few minutes so trichome heads sink.

6. Pour through the bags. Pour the water through the stacked bags in the first bucket. The work bag catches plant matter. Lift it out and set the material aside for a second run if you like.

7. Pull the bags one at a time. Lift each bag slowly and let water drain. Resin collects at the bottom of each bag. The finer bags will hold different sized trichome heads.

8. Collect the resin. Gently press the bottom of each bag to remove extra water, then scrape the resin out with a spoon onto parchment or a drying screen. Keep each micron size separate so you can compare grades.

9. Repeat if desired. Run the same material a second or third time. The first run is usually cleanest, and later runs often pick up more plant matter.

Drying the hash

Drying is where many first batches go wrong. Wet hash can grow mold quickly if left damp. Break the resin into small crumbles and spread it thin. Dry it in a cool room with low humidity and gentle airflow, not direct wind, or in a cold space. Turn and crumble it every day or two. Drying can take a week or more. Some hash makers use freeze dryers, which are fast but expensive. When properly dry, the hash should feel sandy and should not clump when pressed lightly.

Micron sizes at a glance

Micron range	What it usually catches
Very coarse work bag	Plant matter
About 160 to 220	Large heads and some plant bits
About 90 to 120	Many of the best trichome heads
About 70 to 73	Smaller heads, often high quality
About 25 to 45	Very small heads and fine debris

Exact sizes differ by bag set. Many hash makers find the middle range bags yield the cleanest resin.

Tips for better results

• Keep water as close to freezing as you can
• Use gentle agitation and short sessions
• Keep a clean workspace and wear gloves
• Label each micron grade as you collect it
• Do not rush drying

Storage

Store dried hash in an airtight glass jar in a cool, dark place. For longer storage, many keep it in the freezer. Label it clearly and keep it away from children and pets.

Next steps

Dried bubble hash can be used as is or pressed with a heat press into rosin, another solventless product. If you are deciding between bubble hash and simpler dry sifting, read our comparison of bubble hash vs kief.

Common problems and fixes

Green hash. Too much plant matter. Agitate more gently, keep water colder and use the first run for your best grade.

Low yield. Material may have few trichomes, or water may be too warm. Try a strain known for heavy resin and more ice.

Moldy smell while drying. The hash is too wet or the room is too humid. Spread it thinner, crumble it more often and lower humidity.

Grow legally and responsibly

Home cultivation is only legal in some states, and each state sets its own plant limits, locking rules and rules about whether plants can be visible from a public place. You must be 21 or older to buy seeds from Kind Seed Co, and you should grow only where your state and city allow it. Check your state rules in our guide to the legal requirements for growing weed plants in your state before you plant. Federal treatment of cannabis seeds is also changing, so read our December 11 2026 seed rule explainer before you order. Keep plants and harvested flower locked away from children, pets and visitors, and never drive after using cannabis. This article is general information. It is not legal advice and it is not medical advice.

Frequently asked questions

What do I need to make bubble hash?

Mesh filter bags in several micron sizes, two buckets, ice, cold water, a stirring paddle, cannabis material and a place to dry the resin.

How long does bubble hash take to dry?

Often a week or more in a cool, dry room. Freeze dryers are much faster.

Can I use dry trim for bubble hash?

Yes. Dry trim works, though many hash makers prefer fresh frozen material for cleaner results.

Is bubble hash solventless?

Yes. It uses only ice and water to separate trichomes.

Final thoughts

Making bubble hash with ice water is simple in concept: cold breaks trichomes loose, water carries them and mesh bags sort them. Keep everything cold, agitate gently, collect each grade separately and dry thoroughly. Check your local law first, and with practice you can turn leftover trim into a clean, solventless concentrate.

Ready to start

Browse the full range in the Kind Seed Co shop or go straight to 710 seeds. Kind Seed Co sells only to adults 21 and older. Always follow the cannabis laws where you live.