Home > Products > Lawn & Garden > Indoor Gardening > Growing Media > Hydrofarm 40L GrowIt Clay Pebbles 4mm-16mm Hydrofarm 40L GrowIt Clay Pebbles 4mm-16mm Log in to see availability and pricing. Item Number: HYFGMC40L Case Qty: 1 Min Qty: 1 UPC: 503451715026 Manufacturer: Hydrofarm- Par Source MSRP:$31.99 Product Description Product Availability GROW!T® Clay Pebbles40L Bag of 4mm - 16mm PebblesMade from 100% natural clay. They are clean, pH stable, and offer great aeration and drainage in hydroponics, especially in flood and drain, deep water culture, and drip feed systems. Due to their non-uniform structure and large surface area, they offer the ideal environment to foster beneficial bacterial growth around the root zone, leading to naturally healthier plants. Log in for warehouse specific availability. You may also be interested in... MSRP: $30.49 Hydrofarm 10"x20-3/4" Seedling Heat Mat 17 watt Item #: HYFMT10006Mfg #: MT10006 Min Qty: 1 Click here for pricing and availability. PVP Perlite Coarse 4 Cubic Feet (36/Pallet) Item #: PVP105408Mfg #: 105408 Min Qty: 1 Click here for pricing and availability. MSRP: $13.79 Hydrofarm 10L GrowIt Clay Pebbles 4mm-16mm Item #: HYFGMC10LMfg #: GMC10L Min Qty: 1 Click here for pricing and availability. MSRP: $25.49 Hydrofarm 25L GrowIt Clay Pebbles 4mm-16mm Item #: HYFGMC25LMfg #: GMC25L Min Qty: 1 Click here for pricing and availability. MSRP: $6.59 Hydrofarm 7" Humidity Dome Item #: HYFCK64081Mfg #: CK64081 Min Qty: 25 Click here for pricing and availability.