How to Make Bubble Hash (Ice Water Extraction)

By DIG Dave · 4 min read ·

Bubble bags nested in a bucket of ice water during cannabis hash extraction

Make bubble hash by nesting micron bubble bags in a bucket of ice-cold water (around 1–5°C), adding frozen sugar-leaf trim, then stirring gently for 10–15 minutes — not aggressively for 45 — so the cold snaps brittle trichome heads off without breaking plant matter through the screens. Let it settle, lift the bags top-down, and the finest bag holds the cleanest heads. Expect roughly 6–10g of hash from 100g of decent trim (about 1:18). Dry it slow and cold for 3–7 days, broken into fine granules, never with heat.

Bubble hash is the step up from dry sift for when you’ve got a decent stash of trim saved and want to process it all at once. It’s solventless, it’s potent, and it’s a wet, two-hour job that rewards patience over muscle. Here’s how to do it without making green sludge. (For the why behind the cold — resin heads, brittleness, the lot — the Hashish chapter of The Dark Arts teaches it start to finish.)

The short version:

  • Ice-cold water + gentle agitation breaks trichomes off; micron bags filter by size
  • You need bubble bags, two buckets, ice, cold water and ~2 hours
  • Worth it at scale — an ounce or two of trim minimum, not one small plant
  • Stir gently for 10–15 minutes, not aggressively for 45 — over-agitation ruins it
  • Dry it slow and cold for days; never with heat, or it moulds or melts

Want the full breakdown? Keep scrolling.

What do I need, and is it worth it?

A set of bubble bags (nylon bags with micron screens that nest in a bucket like Russian dolls), two 20-litre buckets, a big bag of ice, cold water, something to stir with, and about two hours in a kitchen you don’t mind getting wet (DIG stock bubble bag sets).

Step 1, the kit: four micron bubble bags from the finest purple 25 µ to the blue 220 µ work bag, two 20-litre buckets, ice, a jug of cold water, a wooden spoon and a freezer bag of frozen sugar-leaf trim

Be honest with yourself first: bubble hash rewards scale — an ounce of sugar-leaf trim minimum, ideally two or more. With one small autoflower’s worth of trim, dry sift is a better use of your time. And the yields are modest: from 100g of decent trim, expect roughly 6–10g of hash — about a 1:18 ratio of trim to hash, a long way from the YouTube production lines. A first home run might fill a small jar. That’s normal; the quality more than makes up for the quantity.

What’s the process?

Step 2, nest the bags finest first: the purple 25 µ bag lines the bucket, the blue 220 µ work bag goes in last, every collar folded over the rim

Nest the bags in the bucket, finest micron on the bottom, coarsest on top, fill about two-thirds with ice-cold water, add your frozen trim to the top (work) bag, more ice on top, and let it sit 15 minutes to get properly cold (around 1–5°C — colder is better, non-negotiable).

Step 3, water, frozen trim, ice: the nested bucket two-thirds full of ice water at 1–5 °C, frozen trim tipped from a freezer bag onto the ice

Then stir gently for 10–15 minutes, not 45. This is where the Lumberjack fails — aggressive churning shatters plant matter small enough to pass the screens, ruptures the trichome heads, and warms the water, giving green sludge instead of golden hash. Let the ice and cold do the work; gentle movement is enough to snap brittle heads off.

Step 4, stir gently for 10–15 minutes: a slow stir with a wooden spoon beside the wrong way, a drill paddle churning the water into green sludge

Then let it settle 15 minutes so the heaviest, purest heads sink through the bags.

Step 5, let it settle 15 minutes: a cutaway of the bucket, four nested bags with purple outermost, trim and ice floating, the golden trichome heads sinking through every mesh to the finest

Lift the bags out from the top down, draining each — the top holds spent plant matter, the bottom (finest) holds the cleanest trichome heads.

Step 6, lift the bags top down: the blue 220 µ work bag held above the bucket, spent trim on its mesh bottom, water draining back in

Step 7, then each bag in turn: the red bag lifted and drained, wet resin on its mesh, the black and purple bags still in the bucket

Step 8, scrape it off the screen: the purple 25 µ bag inside out over a bowl with a small lump of wet bubble hash on a teaspoon

You can run a second wash for a bit more; a third is diminishing returns.

How bubble bags sort resin by size Bubble hash works by sorting trichome heads through a stack of nested mesh bags. The coarsest screen sits at the top and the finest at the bottom. With frozen trim in ice-cold water the resin heads turn brittle and break off, then sink and pass through each screen until they are caught by one fine enough to hold them. The middle screens catch the cleanest, full-melt resin; the coarsest catches plant bits and the finest catches the smallest, slightly less pure heads. The cold is what frees the resin. How bubble bags sort the resin Coarse on top, fine at the bottom — size does the sorting coarsest (220 µm) — catches plant bits middle (120–73 µm) — cleanest resin finest (25 µm) — smallest heads ice water collects below frozen trim + ice water · gentle stir · heads snap off and sink The cold does the work — brittle resin breaks free, then each screen catches it by size. The same principle as dry sift, just wet.

How do I dry bubble hash properly?

Step 9, press the water out: a small disc of wet hash folded in a tea towel, two palms pressing down

Slowly, and never with heat — heat destroys terpenes, degrades potency, and can melt the resin into a sticky mess that won’t cure. Break the wet patty up before it dries. I push it through a kitchen sieve with the back of a spoon, onto parchment laid on a slab of thick cardboard. The cardboard wicks the water out; a plate or a tray will not. A microplane grater does the same job and some people prefer it, but the blades can cut the heads, so the sieve is gentler and it is how I do it. Spread it thin, keep it in a cool, dark, airy room for three to seven days until it is completely dry and crumbly, and never use heat.

Step 10, sieve, spread, dry 3–7 days: the back of a spoon pushing the small wet patty through a kitchen sieve onto parchment laid on thick cardboard

Common questions

How much bubble hash will I get from trim?

Roughly 6–10g from 100g of decent sugar-leaf trim — about a 1:18 ratio. A small home run might just fill a little jar, which is normal; the quality is the point.

Why is my bubble hash green and harsh?

Over-agitation. Stirring too hard and too long breaks plant matter through the screens and ruptures the trichomes. Stir gently for 10–15 minutes and let the cold do the work.

How do I dry bubble hash?

Push the wet patty through a kitchen sieve with the back of a spoon (a microplane works too, but its blades can cut the heads) onto parchment laid on thick cardboard, spread it thin, and dry it in a cool, dark, airy room for 3–7 days until completely crumbly. Never use heat — it ruins it and wet hash moulds.

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