NPK Industries RAW Silica 2lb Planting & Watering Water Filtration It features built-in rubber stoppers

It features built-in rubber stoppers that dampen slamming vent blades and ensure complete blockage

scalability is built-in

This balanced NPK series offers targeted nutrition to support every stage of plant growth

Relative humidity via an RH sensor

Heavy-duty build features aluminum blades

NPK Industries RAW Silica 2lb Planting & Watering Water Filtration It features built-in rubber stoppersDescription NPK RAW Silica 2lbs NPK RAW Silica 2lbs: RAW Silica contains 45% Silicon Dioxide which is the highest concentration of silicon dioxide available to the home gardener. RAW Silica is flowable and suspend able in water and naturally available to the plant. Since RAW Silica is a natural form of silicon dioxide, it is PH neutral and does not cloud when added to water. RAW Silica can be used during all stages of growth and bloom for optimal stem