![Ona Polar Crystal Block 170G](http://dieppehydroponics.com/cdn/shop/products/OnaPolarCrystalBlock170G_{width}x.jpg?v=1645733295)
Description
ONA Block Fresh Linen provides long-lasting protection against airborne persistent smells and leaves a marvellous fresh fragrance.
ONA Block is a simple and efficient solution. All you have to do is make some little holes on the top cover and let it evaporate.
It comes in 170 g containers.