Net Pots & Mesh Cups for Hydroponics
Net pots -- also called mesh cups or net cups -- are the plant holders used in DWC, RDWC, NFT, and other hydroponic systems. They hold the plant and growing media securely in the lid or panel of the hydroponic system, while the wide mesh openings allow roots to pass through freely into the nutrient solution or NFT channel below. Unlike solid pots, net pots allow maximum oxygen exposure to roots from all sides, contributing to the fast root development and growth rates that hydroponic systems are known for.
Net Pot Sizes -- Matching Size to System
Net pot size is determined by the size of the hole in your hydroponic system lid or NFT panel. Standard sizes include 1 inch (propagation and small hydroponic seedling trays), 2 inch (aeroponic cloners, small NFT channels), 3 inch (DWC systems for small to medium plants), and 4 inch (standard DWC bucket lids for full-size plants). Larger 5, 6, and 8 inch net pots are used in larger reservoir lids and standalone systems with bigger growing sites. When ordering net pots, match the outer diameter to your system lid hole size -- most standard DWC 5-gallon bucket lids accommodate either a 6-inch net pot (single large plant) or four 2-inch net pots in a pre-drilled multi-site pattern. For DWC grows with full-size plants, 6-inch net pots are the most common choice as they hold adequate media volume to support the plant before roots establish in the reservoir.
Net Pot Materials & Styles
Round mesh net pots are the standard format -- solid rim with a deep mesh basket. Slotted (square) mesh cups are an alternative with wider slot openings that allow slightly larger root passage and better drainage. Both function equivalently in most hydroponic applications. Polypropylene net pots are the most durable and UV-resistant format -- appropriate for both indoor and outdoor hydroponic applications. Qualified brands include Gro Pro, Active Aqua, and Hydrofarm, all available in bulk packs for commercial operations.
Growing Media for Net Pots
Net pots are always used with a growing media that holds the plant in the pot and provides structural support during the early growth phase before roots establish. Hydroton (expanded clay pebbles) is the most widely used media for DWC net pots -- it is pH neutral, reusable after sterilization, and its round shape creates plenty of void space for air and solution movement. Rockwool cubes are used to start seeds or root clones before transplanting into larger net pots. Starter plugs and rapid rooter plugs go directly into a 2-inch net pot for germination in small hydroponic seedling systems. For larger 4-6 inch net pots, fill with a single 2-inch rockwool cube in the center surrounded by hydroton to hold it in place.
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Net Pots FAQ
What size net pot do I need for DWC?
For full-size plants in a 5-gallon DWC bucket, a single 6-inch net pot is the standard -- it holds enough growing media to support a mature plant canopy and its opening fits the standard bucket lid hole. For multi-site DWC systems with smaller plant spacing, 2-inch or 3-inch net pots are used in close-spaced lid configurations for leafy greens or small herb plants. For aeroponic cloners, 2-inch net pots are universal. Match the net pot outer diameter to the hole size in your system lid -- most bucket lids are pre-drilled for either 6-inch or a multi-site 2-inch pattern.
What growing media should I put in net pots?
Hydroton (expanded clay pebbles) is the standard choice for DWC net pots -- it is pH neutral, reusable, drains well between flood cycles, and creates excellent root air exposure through its many void spaces. Rinse hydroton thoroughly before use to remove clay dust that can cloud the reservoir. For starting seeds or cuttings, a 1-inch starter plug, rapid rooter, or small rockwool cube goes directly into a 2-inch net pot and can be transplanted into a larger net pot filled with hydroton once roots emerge. Avoid potting soil or organic media in net pots for recirculating hydroponic systems -- organic media particles break down and can clog pumps and air stones.
Can I reuse net pots?
Yes -- net pots are fully reusable and designed for multiple growing cycles. After each cycle, remove old roots and growing media, then soak net pots in a diluted cleaning solution (hydrogen peroxide or bleach at 1:50 dilution) for 30-60 minutes, rinse thoroughly with plain water, and let dry completely before reuse. Hydroton media can also be sterilized and reused: rinse to remove debris, soak in hydrogen peroxide solution, rinse again, and dry before reloading. Polypropylene net pots hold up well through many cleaning cycles if handled without cracking the mesh -- inspect for cracks or mesh separation before reuse as damaged pots can drop media into the reservoir.
How many net pots do I need for a DWC system?
One net pot per plant site -- so the number of net pots you need equals your total plant count across all DWC buckets or grow sites. Most hobby DWC systems run 1-8 plant sites, so 1-8 net pots. Order extra net pots to have spares on hand for propagation starts or for replacing any that crack. Net pots are inexpensive and available in bulk packs of 50-100 -- buying in bulk makes sense for any operation running more than a few plant sites, and surplus pots store indefinitely.
