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3.1L SubBox™ Bulk Substrate

£5.95

Heard of the Monotub Tek?

If you have then you’ll know it’s how to turn grain spawn into a whole load of mushrooms!

We based our product idea on the well-known ‘Monotub Tek’, but made it simpler, cleaner, faster, modular and with less fuss. It trully is a game changer for anyone who has tried or wants to try their hands at monotub-style growing!

Excellent airflow and sized to fit our XL Grow Tent for easy mushroom fruiting.

SubBox™ has the perfect bulk substrate depth and fruiting area for achieving large harvests without the hassle.

200g of Organic Dry Coir within a HEPA-filtered SubBox™

Simple, effective and a better way for bulk mushroom growing, born during our Winter 2020 innovation break

Uniquely ours …as injection ported MycoPots/Boxes used to be till the copycat competition came along! (Ok, enough of our ranting..)

 

How to use?

  1. Add 1 litre of water which will make the substrate expand to around 2 litres

  2. With a corner of the lid raised to allow steam to vent, microwave for 5mins

  3. Shake around (careful, hot!) and microwave for a final 5mins

  4. Click lid fully down and allow to cool to room temperature (a plastic bag is ideal to keep it clean whilst cooling)

  5. Remove lid then add 1 litre of spawn (2x SpawnTubs / 1KG SpawnBag worth)

  6. Mix evenly with clean hands and cover the exposed grain at the top with some of the hydrated coir

  7. Click lid down fully and leave to finish colonising in a warm area

  8. Once 100% colonised with healthy white mycelium, move to fruiting chamber* and introduce fruiting conditions

*Or purchase one of our XL Mushroom Grow Tents to fit securely over the SubBox™, like the image below!

SubBox fruiting mushrooms

Note:
If you would prefer to use a very large fruiting chamber to have lots of SubBoxes in action, then you can calculate how many you need using the measurements below and how big the chamber is that you have. But as a reference, 6 of these will fit into the massive Ikea ‘Samla’ 130L plastic boxes! So you could have 6 different species of mushroom all growing in the same time – though be prepared for a lot of work harvesting your huge mushroom crops!

Growing Specs

  • Fruiting area: 56 sq inch
  • Substrate depth: 4″
  • Spawn to Substrate Ratio: 1:2 (Add 1 litre of spawn to the prepared substrate)
  • Substrate Volume (when hydrated): 2000ml
  • Substrate Volume (with spawn added): 3000ml

SubBox™ Specs

  • Volume: 3100ml
  • Material: PP5
  • Dimensions: 7.5 x 7.5 x 4 inches
  • Autoclavable/Microwavable: Yes
  • Reusable: Yes
  • Filtration: HEPA 0.2μm

 
  Ask questions about this product here!

    when you say to add a final layer of hydrated coir, does that mean after microwaving and cooling, that i should take some hydrated coir out for the casing layer before mixing the spawn in, other wise i wouldn't have any coir left for casing right ?
  1. Q when you say to add a final layer of hydrated coir, does that mean after microwaving and cooling,...... Read more answer now
    Asked on 8th April 2021 1:03 pm
    A Yes that's right. Keep a little bit of itfor a thin final casing layer :)
  2. if i dont want to use the bulkmix or want to save money, can i add gypsum and verm to the container before putting in the microwave, and if so, then how much ?
  3. Q if i dont want to use the bulkmix or want to save money, can i add gypsum and verm to the contain...... Read more answer now
    Asked on 5th April 2021 4:46 pm
    A

    Hi there, you can feel free but you’ll really need to work out all the math yourself as it’s beyond the scope of this product!

  4. but where can i purchase this box separately? i tried to search its up by typing 3.5L sub box, and nothing came up.
  5. Q but where can i purchase this box separately? i tried to search its up by typing 3.5L sub box, an...... Read more answer now
    Asked on 1st April 2021 4:44 am
    A

    It’s not up yet. We’ll make it available later on when we have a minute. Thanks

  6. hey, just wanted to ask, could i add gypsum, coffee grounds, and vermiculite to add more nutrients to the substrate ? so for example if i wanted to add all 3 of those ingredients i mentioned how much would you use ?
  7. Q hey, just wanted to ask, could i add gypsum, coffee grounds, and vermiculite to add more nutrient...... Read more answer now
    Asked on 31st March 2021 6:36 pm
    A

    Adding coffee is a bad idea unless it’s being kept sterile fully sterile until full colonisation. Don’t mix coffee in with this.

    If you really want, we provide BulkMix (search for it) which perfectly hydrated Coir, Verm and Gypsum. These tubs can be purchased individually and used with it.

  8. Hi, i dont have a microwave, is there another way to sterelize the subbox?
  9. Q Hi, i dont have a microwave, is there another way to sterelize the subbox? answer now
    Asked on 22nd March 2021 1:27 pm
    A

    Yes, you could place tin foil over the lid and steam sterilise in a large pot. You could also use a pressure cooker.

  10. I only have 1 spawn tub on the go and just read that you advise using 2 tubs. Will I get away with using 1 this time around or should I get another tub ordered pronto?
  11. Q I only have 1 spawn tub on the go and just read that you advise using 2 tubs. Will I get away wit...... Read more answer now
    Asked on 19th March 2021 2:14 pm
    A Three options, one is to use half of the coir mix. Weigh out 100g and mix with 500ml of water. Option two is to do just what you said, you have a very high chance of it working just fine. Though not quite as high as option three. Option three is to order another SpawnTub, then shake about 10% of the colonised grain into it (within a SAB of course). It will colonise so fast your head will explode!

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