This is the Largest Size of natural Pumice Stones (Wt-450 GMS). Most of the plant lovers find this size of Pumice (Size: 30-50 MM) more suitable for Aquarium, Orchid, Horticulture and other big plants. Due to bigger size, air cavities inside them are bigger and suitable for Orchids.

If you wish to use this Pumice for mulching (top soil layer) of Adenium and other bigger plants, this size is correct choice, as per our opinion. Mulching of Pumice does not attract fungus or insects.

Pumice stones have porous composition and they are much lighter than ordinary stones. They contribute in soil aeration also. Pumice improves the quality of soil because of its porous properties.

With use of a hammer, we can easily break the Pumice into smaller pieces (as per our requirement). Other sizes of Pumice stones are made after crushing such bigger Pumice Stones. This is the natural size of Pumice stone and the cheapest also.

They retain moisture in optimum quantity and provide needful micro-nutrients continuously to plants’ roots. Pumice stones ensure proper drainage in soil. All nutrients can be stored in the small holes of these stones for continuous supply to plants.

Ph value of pumice ranges from 7 upto 8. Ph value of 7 is considered neutral. More than 7 value shows alkaline content and less than 7 indicates acidic content. After washing of pumice its Ph value comes down partially.  Pumice stones have a tendency to absorb atmospheric moisture, hence we may observe small droplets inside this pack, as a result of evaporation during hot weather. We have shown here all the 4 sizes of pumice available with us for reference of our customers.

For experiment, we mixed samples of all four sizes of Pumice stones and tried to submerge in water filled glass pot (image is shown for your reference). We observed that If size of Pumice rock is big enough (bigger than 15mm), we can easily see most of them floating over water due to light weight and availability of more air cavities inside pumice rocks.

But, if we break them into smaller pieces, air cavities of pumice gets filled up with water and find it bit difficult to float on water. But surprisingly, more than 50 %  of 2-4mm Pumice stones were also seen floating on water surface. Bigger Pumice showed more chances of floating.

Pumice stones are naturally made from volcanic rocks and therefore they are not found naturally in India. These stones are imported from other countries where Volcanoes are available. 2-4 % Pumice dust may be available in this pack.

Use for Aquarium: Pumice stones are also used in Aquarium for water purification You have to wash it many times before using in aquarium, otherwise water of aquarium may look milky. It is suggested that you may use appropriate water filter also for aquarium to minimize its milkiness (if required).