Flo-n-Gro 70 Gallon Reservoir - White Humidifiers | Dehumidifiers The #3 measures around 1/2

The #3 measures around 1/2 inch and the Coarse is about 1/8 to 1/4 inch

It also provides a safe

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It can be used for plants growing in hydroponics

Flo-n-Gro 70 Gallon Reservoir - White Humidifiers | Dehumidifiers The #3 measures around 1/2The Flo n Gro reservoirs and lids are made from a premium ABS plastic. They feature a UV inhibitor that prevents them from breaking down when exposed to natural or artificial lighting. They are also resistant to cracking. The reservoirs feature a two piece lid which allows you to easily check your water level. They can be used as a water source for many different hydroponics systems. Reservoirs and lids sold separately.