Bubble Hash Ice Ratio Calculator — How Much Ice Per Run (Canada)

Starting Material Weight

Wash Vessel Size

Room Temperature (°C)

Tap Water Temp (°C) Auto-suggest: ❄️ Winter (4°C) · ☀️ Summer (12°C)

Ice Source

Your Ice & Water Plan

Ice Needed

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Water Volume

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Expected Slurry Temp

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Est. Ice Cost

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Slurry Temperature vs. Target Zone

Target: 0–4°C

-2°C 0°C 4°C 8°C 12°C 16°C 20°C

Below 0°C — too cold, material freezes solid

0–4°C — ideal trichome preservation

5–8°C — acceptable, more chlorophyll risk

9°C+ — trichomes soften, quality drops

🇨🇦 Canadian winter tip: If it's below -5°C outside, fill a bucket with water the night before and let it chill outdoors. Costs $0. Brings tap water down to 1–2°C before you even add ice. In most provinces November–March, you can cut your ice budget in half this way — or skip bought ice entirely if you have clean snow to melt.

Ice Cost Comparison

Source	Cost	Amount for This Run	Total

The Numbers Behind the Calculator

Ice-to-material ratio

The standard starting point is a 1:1 ratio by weight — 1 kg of ice per 1 kg of starting material — with the remainder of vessel volume filled with cold water. For higher-quality material or warm ambient conditions, push it to 1.5:1 or even 2:1 to keep the slurry cold through a full 15-minute agitation cycle.

Vessel size sets a hard ceiling. A 5-gallon bucket holds roughly 19 litres total. Leave about 25% headroom so you can actually stir without overflow.

Why slurry temperature matters

Trichome heads are mostly lipids. At 0–4°C they're brittle and snap off the stalk cleanly. Above 8°C they start to soften and smear. Warm washes produce green hash with more plant contamination and a lower melt quality — you'll lose stars on every bag.

Room temperature is a real factor. If you're washing in a 25°C kitchen in July, you need significantly more ice than someone washing in a 15°C garage in October.

How slurry temp is estimated

The calculator uses a simplified thermal model: it mixes the heat capacity of water (4.18 kJ/kg·°C) with the latent heat of ice (334 kJ/kg) against your room temp and tap water starting temp. It's not a lab-grade simulation — real slurry temp depends on your vessel insulation, how fast you agitate, and how long you let it sit — but it's accurate enough to tell you whether you're in the right ballpark before you start.

Ice sources in Canada

Draft ice from a convenience store or gas station is typically $0.60–0.75/kg. A 10 lb bag at a grocery store (Loblaws, Sobeys, Metro) runs about $5, or $1.10/kg — more expensive per kilogram but more convenient in smaller quantities. Costco sells 20 lb bags for around $5 in stores that carry it.

If you run multiple washes per season, buying a chest freezer and making your own blocks is cost-effective above roughly 4–5 runs per year. A standard bag freezer makes about 4 kg of ice overnight.

Wash Vessel Sizing Guide

1-gallon (4 L) — small test batches

Best for 14–28g (½–1 oz) of material. Very little thermal mass, so you need more ice relative to your run size. Works well as a "quality check" bucket before committing a full bag to a 5-gallon run.

5-gallon (19 L) — most home growers

The standard home setup. Handles 50–200g comfortably, though most people max out at 100g per wash for clean results. Brute 5-gallon cans from Canadian Tire run about $28 and are food-safe.

20-gallon / washing machine

Commercial or semi-commercial scale. The Bubble Magic 5-gallon washing machine takes roughly 14 L of water + ice. The 20-gallon version holds upward of 70 L. These buckets are filled the same way — ice ratio by material weight still applies, the vessel just sets your maximum batch size.

Don't fill to the top. Leave at least 20–25% of vessel volume empty. Ice floats, material swirls, and a full bucket will overflow the moment you start stirring.

Canadian Tap Water Temps by Season

Canadian municipal water temp varies significantly by province and season. These are rough averages for cold-water tap (not run through a water heater):

Season	BC (Coast)	AB / SK	ON / QC	Atlantic
Winter (Dec–Feb)	5–8°C	2–5°C	3–6°C	4–7°C
Spring (Mar–May)	7–11°C	5–9°C	5–10°C	6–10°C
Summer (Jun–Aug)	10–14°C	10–15°C	12–18°C	10–15°C
Fall (Sep–Nov)	8–12°C	6–10°C	7–12°C	7–11°C

Most harvest washes in Canada happen October–November, when tap water is already 6–10°C — your ice budget is lower than a summer run. Prairie provinces run the coldest tap water in winter; BC coast the warmest year-round.

🇨🇦 Prairie advantage: In AB, SK, and MB during winter, your cold-water tap may already be at 2–4°C right out of the line. In those conditions, you may only need ice for the first chill — not throughout the whole wash. Check with a thermometer before buying a full bag.

Tips for Keeping Your Slurry Cold

Pre-chill everything

Put your bags and bucket in the garage or cold room for an hour before washing. A bucket that starts at 15°C absorbs ice energy before you even add material. Pre-chilling to outdoor temp (if it's 5°C outside) is free insurance.

Work fast

Keep each agitation cycle to 10–15 minutes. The longer you stir, the warmer the water gets and the more plant matter breaks down into the wash. Three 12-minute washes beats one 45-minute wash every time.

Lid or insulation

A cheap cooler insert or even a folded piece of foam on top of the bucket while stirring slows heat absorption from room air. In a warm room (22°C+) this makes a measurable difference on wash 2 and 3.

Add ice between washes

Don't try to get all your ice savings upfront. Keep a bag in reserve. After draining wash 1, refill with cold water and fresh ice for wash 2. Your material is already cold so you need less ice to hit temperature.