Cultiwool Stonewool Block - 4 x 4 x 2.5-in - 1 Plug Hole - Width Grooves - 216 Count

Even Water Distribution for Transplants - 4 x 4 x 2.5-in Blocks

Uneven wetting and badly placed drippers leave parts of a substrate too wet or too dry. These Cultiwool stonewool blocks add a donut ring water chamber around the plug hole, so a dripper sits in the right spot. Grooves on the underside help water move beneath the block.

This unit holds 216 blocks, which suits growers who propagate or transplant in volume, such as regular indoor growers and commercial operations. Hobbyists starting a small run should expect to have plenty left over.

Key Features & Benefits

• Donut ring water chamber — gives your dripper a defined position around the plug hole and helps water spread through the block.
• Width grooves for drainage — help water flow under the block and reduce contact with the surface it sits on.
• Black/white foil — helps prevent algae growth on the block.
• Stonewool material — a familiar substrate for hydroponic systems.
• Plug hole 38mm / 40mm — one plug hole per block.

Who Should Use Cultiwool 4 x 4 x 2.5-in Blocks

Growers moving started plugs into a larger substrate for vegetative growth or flowering will find these useful, especially with drip irrigation. They suit cultivation tables and hydroponic systems.

About Cultiwool Stonewool Block

Cultiwool makes stonewool growing blocks. This block measures 4 x 4 x 2.5 inches, has one plug hole of 38mm / 40mm, and uses width grooves for drainage. One unit contains 216 blocks.

Frequently Asked Questions

Q: What size is this block?
A: It measures 4 x 4 x 2.5 inches. It has one plug hole of 38mm / 40mm.

Q: How many blocks come in one unit?
A: One unit holds 216 blocks. It is sold as a single unit.

Q: What is the donut ring?
A: It is a water chamber around the plug hole. You place the dripper in it so water spreads more evenly through the block.

Q: Why does the block have grooves underneath?
A: The width grooves help water flow beneath the block. They also reduce the contact area with the surface below.

Q: What does the black/white foil do?
A: The foil is there to prevent algae growth on the block.

Q: What is stonewool?
A: Stonewool is an inert, fibrous growing medium made from spun rock. Growers use it in hydroponic systems.