Cultiwool 4 x 4 x 4-in Stone Wool Block - 144 Count

Even Water Flow Under Every Plant - 144 Blocks

Uneven moisture and standing water at the base of a block can slow root development. These stone wool blocks have drain grooves on the underside that improve water flow beneath each block and reduce contact with the surface it sits on. A black-and-white film covering is designed to limit algae growth.

The 4-inch cube suits growers moving started plugs into a larger root-zone medium in hydroponic systems. A unit of 144 blocks fits regular indoor setups and larger rooms that need a consistent supply of media.

Key Features & Benefits

• Stone wool construction — a consistent medium for hydroponic growing and root-zone development.
• Bottom drain grooves — improve water flow under the block, useful on cultivation tables and hard floors.
• Black-and-white foil — helps limit algae growth on the block surface.
• 38/40 mm plug hole — takes a started plug of matching size.
• 4 x 4 x 4-in size — about 100 mm per side, a practical size for transplanting.

Who Should Use Cultiwool 4 x 4 x 4-in Block

Indoor and commercial growers running hydroponic systems who want a uniform stone wool block for vegetative growth and flowering stages will find these a practical choice. Home growers who plan to fill many sites can also buy them in this 144-block quantity.

About Cultiwool 4 x 4 x 4-in Block

Cultiwool makes stone wool substrate blocks for hydroponic cultivation. This block measures 4 x 4 x 4 in (about 100 x 100 x 100 mm), has a 38/40 mm plug hole, and includes drain grooves on the bottom. It is supplied as a unit of 144 blocks.

Frequently Asked Questions

Q: How many blocks come in one unit?
A: Each unit contains 144 blocks. The listing is sold as one unit.

Q: What size plug fits the hole?
A: The plug hole is 38/40 mm. Choose started plugs that match that opening for a snug fit.

Q: What are the bottom drain grooves for?
A: They improve water flow under the block and reduce the contact area with the surface below. This helps most on cultivation tables and concrete floors.

Q: What is stone wool?
A: Stone wool is a fibrous growing medium made from spun mineral material. Growers use it in hydroponic systems to hold water and support roots.

Q: Why is the block covered in black-and-white foil?
A: The covering is designed to limit algae growth on the block surface. It also helps keep the medium tidy during use.