Gordo Tek Refill | Dung-Loving Substrate & Peat Casing Mix – Midwest Grow Kits
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Refill Kit for Complete XL Specialty Grass Lover's Kit

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$4999
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Reset your Grass Lover's XL tote with 9 lbs of pasteurized horse manure-based substrate and 5 lbs of sterilized peat casing, or buy either one on its own. GordoTEK approved. Grain spawn not included.

Variety

Description

The Refill Kit for the Complete XL Specialty Grass Lover's Kit resets your tub for the next grow without mixing a batch of substrate yourself. It holds the same pasteurized horse manure-based substrate and sterilized peat casing that come in the XL kit, sized for a full GordoTEK tote. Buy the complete refill, or just the substrate or casing.

Midwest Grow Kits team member unloading bags of substrate from a Blue Myco autoclave
Fresh from our autoclaves to your tote

The same substrate and casing that ship in the XL kit, made in-house and vacuum sealed. Skip the bucket, the measuring and the cook.

  • GordoTEK approved
  • Pasteurized substrate
  • Sterilized casing
  • Ready to use
  • 9 lbsManure substrate
  • 5 lbsPeat casing
  • 3 × 3 lbVacuum-sealed bags
  • 3 optionsComplete or single

Pick your refill

Complete refill: three 3 lb bags of manure substrate and a 5 lb bag of peat casing
Complete Refill ($49.99)

9 lbs of manure-based substrate in three 3 lb bags plus 5 lbs of casing. Everything for one full XL tote, with casing left over.

Three vacuum-sealed 3 lb bags of horse manure-based substrate
Substrate only ($37.99)

Just the 9 lbs of substrate. Pick this if you still have casing from your last grow.

5 lb bag of sterilized peat moss and vermiculite casing mix
Casing only ($18.00)

Just the 5 lbs of casing. Enough for several thin GordoTEK casing layers.

Running the refill

Same steps as the first grow. Spawn isn't included, so start three 32 oz 5-grain jars a couple of weeks ahead. GordoTEK's Easy Tek page has the full method and video.

Gloved hands sprinkling colonized grain spawn from a 32 oz jar over manure-based substrate in a shallow tote 1Spawn to substrate

Mix your colonized grain into the three bags of substrate in the clean grow tote and pat it smooth.

Grower's Select digital aquarium heater and digital probe thermometer for the water bath 2Back on the bath

Float the tote on the warm water bath in the low 80s °F with the lid closed until it is fully colonized.

Gloved hand sprinkling a thin layer of peat and vermiculite casing over colonized substrate 3Thin casing

Sprinkle about 1/4" of casing evenly across the surface and spray it down.

Hand misting a window screen clipped over a shallow tote, with the wet lid resting at an angle to leave corners open 4Screen and mist

Screen on, mist three times a day, and set the lid at an angle with two corners open.

What's inside

  • 9 lbs Grass Lover's horse manure-based substrate (three 3 lb bags): sun-aged, pasture-fed horse manure, finely chopped straw, coir, vermiculite and a pH buffer, hydrated, pasteurized at 160°F for 3–4 hours and vacuum sealed
  • 5 lbs sphagnum peat moss & vermiculite casing: pH-adjusted and sterilized like our Master's Mix bags, ready to use out of the bag
  • The Substrate-only and Casing-only options include just that component

Specifications

Specification Detail
Fits Complete XL Specialty Grass Lover's Kit (2 × 41 qt low-profile totes) and any GordoTEK-style tote grow
Substrate 9 lbs, 3 × 3 lb vacuum-sealed bags, pasteurized 160°F for 3–4 hrs
Casing 5 lbs sphagnum peat moss + vermiculite, pH-adjusted, sterilized
Grain spawn Not included; use three 32 oz 5-grain jars
Spores / culture Not included

Build out your grass lover's setup

Complete XL Kit XL Refill Kit Tray Kit 5-Grain Jars, 32 oz
Use it for First full-size tub grow Every tub grow after Smaller grows in trays Spawn for any of them
You get Totes, heater, grain, substrate, casing 9 lbs substrate + 5 lbs casing 6 lbs substrate, 5 lbs casing, trays 3 × 32 oz grain jars
Grain included Yes, 3 × 32 oz No No This is the grain
Pairs with The XL Refill 3-pack of 32 oz jars Grain jars or a spawn bag Refill or tray kit

Don't forget the spawnPair the refill with a 3-pack of 32 oz 5-grain jars. First grow? Start with the Complete XL Grass Lover's Kit, which includes the totes, heater, screen and thermometer.

FAQ

What's in the Complete Refill?

9 lbs of horse manure-based substrate in three 3 lb vacuum-sealed bags, plus a 5 lb bag of sterilized peat moss and vermiculite casing.

Does the refill include grain spawn?

No. Use three 32 oz 5-grain jars (sold as a 3-pack) for a full XL tote, inoculated with 3–4cc of spores or 5–7cc of liquid culture per jar.

Is the substrate sterilized or pasteurized?

The manure substrate is pasteurized at 160°F for 3–4 hours, the same way as our Willy's Blend. The casing is fully sterilized, the same way as our Master's Mix bags.

How many grows does the casing cover?

GordoTEK's casing layer is thin, about 1/4", so the 5 lb bag covers more than one tote. That's why there's a Substrate-only option for the grows in between.

Will it work without the XL kit?

Yes. It's sized for a pair of 41 qt low-profile totes, but you can use it in any GordoTEK-style tote or tray grow.

Can this refill be used for Panaeolus cyanescens (formerly Copelandia cyanescens)?

Technically, yes: GordoTEK built this method around the warm, high-fresh-air, cased conditions that grassland and dung-loving species need. We sell it for lawful cultivation only, so check your local laws and regulations before growing any species.

Note: This kit is sold for lawful cultivation only. It is not intended to grow Panaeolus cyanescens or Psilocybe natalensis (now ochraceocentrata) unless you are legally licensed by your local agricultural or research authorities. Always check your local laws and regulations before cultivating any species.