Cultivation supplies
by Microppose
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The Mark 1 Mushroom Monotub is a purpose-built cultivation chamber made from durable PP plastic, designed to give your bulk mushroom grows the stable microclimate they need to fruit properly. Measuring 12" x 12" x 12" (roughly 30 x 30 x 30 cm), it sits neatly on standard steel wire shelving while still holding enough substrate for genuinely satisfying flushes. Available in three sizes — Small, Medium, and Large — so you can match the tub to your grow space and ambition.
The Mark 1 Monotub comes in three variants. All share the same 12" x 12" x 12" footprint and PP plastic construction — the difference is in the package configuration from Microppose. The Small (SH0190) is the standalone tub, great if you already own liners and filters. The Medium (SH0196) adds a few essentials to get you started faster. The Large (SH0197) is the most complete kit. If this is your first monotub grow, go Medium or Large — buying filters and liners separately later always costs more. If you've already got supplies from a previous run, the Small saves you doubling up.
| Specification | Detail |
|---|---|
| Brand | Microppose |
| Material | Extra-durable PP (polypropylene) plastic |
| Dimensions | 12" x 12" x 12" (approx. 30.5 x 30.5 x 30.5 cm) |
| Lid | High-clarity transparent top |
| Air Holes | 2" diameter, pre-cut |
| Closure | Clip-lock system |
| Variants | Small (SH0190), Medium (SH0196), Large (SH0197) |
| Fits On | Standard steel wire shelving |
| Recommended Use | Bulk mushroom cultivation (monotub tek) |
Complete your monotub setup: The Mark 1 works best when paired with a few Microppose accessories. The Small Monotub Liner sits inside the tub and shrinks with your substrate as it dehydrates — makes cleanup after your final flush dead simple instead of a scraping nightmare. Monotub Hole Plugs seal the 2" air holes during colonisation to lock in moisture when you need it most. Once you flip to fruiting conditions, swap them for Adherable Monotub Filters, which allow fresh air exchange while keeping contaminants out. For substrate, the ShroomTek All-In-One Mushroom Grow Bag provides a ready-to-go growing medium that pairs directly with this tub. Browse the Shroomshop for liquid cultures and spore syringes to get the biology side sorted.
A monotub is the simplest reliable method for bulk mushroom cultivation at home. The concept is straightforward: a sealed container that holds your colonised substrate, maintains humidity around 90-95%, and allows controlled fresh air exchange during fruiting. The Mark 1 does all three without requiring you to build anything from scratch.
We've seen plenty of growers start with modified storage bins from the hardware shop — holes drilled with a spade bit, polyfill stuffed in as makeshift filters, lids that never quite seal right. It works, sometimes. But the failure rate from contamination is noticeably higher. The problem isn't the concept; it's the execution. Rough-drilled holes leave plastic burrs that trap moisture and bacteria. Ill-fitting lids create uneven humidity pockets. Polyfill compresses over time and stops filtering properly. The Mark 1 solves these issues by giving you precision-cut 2" air holes, a clip-lock seal that actually holds, and a lid with genuine optical clarity — not the cloudy translucence you get from a cheap storage box.
The PP plastic deserves a mention too. Polypropylene is autoclave-safe, meaning you can sterilise this tub properly between grows without it warping, cracking, or leaching chemicals into your substrate. Pick it up and you'll feel the wall thickness — this isn't flimsy stuff. It's the same grade of plastic used in laboratory containers, which is exactly the mindset you want when growing mushrooms: treat it like a lab, get lab results.
The Mark 1 is a tub, not a complete grow system. It doesn't come with substrate, cultures, liners, or filters (unless you opt for the Medium or Large package). If you buy the Small variant expecting a ready-to-grow kit, you'll be disappointed — it's the bare chamber only. Make sure you've got your consumables sorted before your tub arrives.
The 12" x 12" x 12" size is also a deliberate trade-off. It's compact enough for a shelf, a cupboard, or a small closet, but it won't produce the massive harvests you'd get from a full-size 66-litre monotub. If you're growing for personal use and want 2-4 modest flushes, the Mark 1 is spot on. If you're trying to fill a dehydrator every week, you'll need multiple tubs or a larger setup. That said, many growers we've spoken to prefer running 3-4 smaller tubs over one large one — if one tub contaminates, you don't lose everything.
We've carried a fair few cultivation supplies over the years, and Microppose gear consistently gets fewer complaints than the DIY alternatives people cobble together. The clip-lock mechanism on the Mark 1 is genuinely satisfying — it snaps shut with a solid click, no wobble, no gaps. The clarity of the lid is noticeably better than most competitors; you can actually see condensation patterns and surface colonisation without lifting anything. Small detail, big difference when you're trying to judge whether your tub needs misting or is doing fine on its own.
The 2" pre-cut holes are clean and uniform. Compare that to a hand-drilled storage bin where every hole is slightly different and you're already starting from a better position. Microppose also offers a 30-day money-back guarantee on their tubs (excludes grain and substrate), which tells you something about how confident they are in the product lasting.
All three variants share the same 12" x 12" x 12" tub. The difference is in what's included. The Small is the tub alone. The Medium and Large add liners, filters, and hole plugs. If this is your first monotub grow, go Medium or Large to avoid buying accessories separately at higher cost.
Yes. PP plastic handles sterilisation well. Wipe the interior with 70% isopropyl alcohol before each use. You can also wash it with hot soapy water and follow up with alcohol. Don't use bleach — it can leave residue that affects mycelium growth.
Typically 2-4 flushes before the substrate is spent. Each flush produces slightly less than the previous one. Yield depends on species, substrate quality, and how well you maintain humidity and fresh air exchange during fruiting.
No. The 2" air holes are pre-cut and positioned for proper air exchange. Adding more holes disrupts the humidity balance inside the tub. Use Monotub Hole Plugs during colonisation and Adherable Monotub Filters during fruiting — that's the system Microppose designed it for.
Yes. At 12" x 12" x 12", it fits on most common steel wire shelving units. You can stack multiple tubs vertically if your shelf height allows at least 14" clearance per tier to account for the clip-lock lid.
A grow kit comes with pre-colonised substrate — just add water and wait. A monotub like the Mark 1 is an empty chamber that you fill with your own colonised substrate. Monotubs give you more control over species, substrate mix, and yield, but require more hands-on work. They're the next step up from a beginner kit.
You can, but we wouldn't recommend it. Without a liner, mushrooms will pin between the substrate and the tub wall (side-pinning), producing small, hard-to-harvest fruits. The liner also makes cleanup dramatically easier — peel it out instead of scraping dried mycelium off PP plastic.
Last updated: April 2026
Medical disclaimer. This content is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before use of any substance.
