Vulcaponic PON Coarse Grade

2.5 litre will come in a bag 23 x 33 cm as per photo

5 litre will be two of these bags.

3 - 8 mm Medium Grade.

Perfect for growing your plants. 

Semi-hydro is also known as passive-hydro, it refers to the act of growing plants in a soilless planting medium that is inorganic and inert, where the plant is self-watered via a water reservoir. Semi-hydro potting mediums are highly porous.