Perlite 4 Cubic Foot Bag
Perlite 4 Cubic Foot Bag is backordered and will ship as soon as it is back in stock.
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Description
Description
Krum Horticulture Grade AA coarse perlite in a 4 cubic foot bag — about 30 gallons of 100% pure, additive-free volcanic rock. Hydrated perlite slowly releases moisture, so a layer in the bottom of a fruiting chamber helps hold humidity steady.
It’s low-dust with a consistent particle size and contains no fertilizers or additives, which matters for mushroom work. Whether you run one tub or a full grow room, a 4 cubic foot bag goes a long way.
- 4 cu ftBag size
- ~30 galVolume
- AACoarse grade
- 100%Volcanic rock
- KrumHorticulture
Why growers use this perlite
- Steady humidity – Hydrated perlite releases moisture slowly to help hold humidity in fruiting chambers.
- Additive-free – 100% pure volcanic rock with no fertilizers or additives.
- Low dust – Consistent particle size and a low-dust formula.
- Coarse grade – Grade AA coarse perlite holds water while leaving air space.
- Bulk value – A 4 cubic foot bag covers many tubs and chambers.
What you can use it for
- Humidity layers in fruiting chambers
- Monotub and fruiting chamber setups — shop monotubs
- Moisture retention and air space in growing mixes
How to use it
- Rinse. Rinse the perlite in a colander or bucket to wash off fine dust.
- Soak. Soak it in clean water so it’s fully hydrated.
- Drain. Let excess water drain off so it’s moist but not sitting in standing water.
- Layer. Spread an even layer in the bottom of your fruiting chamber.
- Refresh. Re-wet as it dries out, and replace it if it gets dirty or contaminated.
Fighting low humidity? Read why your monotub isn’t pinning (and how to fix it).
Specifications
| Specification | Detail |
|---|---|
| Brand | Krum Horticulture |
| Bag size | 4 cubic feet (about 30 gallons) |
| Grade | AA coarse |
| Composition | 100% pure volcanic rock, no fertilizers or additives |
| Dust | Low dust, consistent particle size |
| Uses | Fruiting chamber humidity, monotubs, growing mixes |
Need less?Try a 1 gallon bag of perlite, or pair this bag with a 4 cu ft bag of organic vermiculite.
FAQ
How much perlite is in the bag?
4 cubic feet, about 30 gallons.
What grade is it?
Grade AA coarse.
Does it have any additives?
No. It’s 100% pure volcanic rock with no fertilizers or additives.
How does perlite help mushroom growing?
Hydrated perlite releases moisture slowly, so a layer in a fruiting chamber helps hold humidity steady.
Do I need to rinse it?
Rinsing helps wash off fine dust before you soak and use it.
