Highly porous structure maximizes air space for strong root development
Optimizes drainage and moisture retention for healthy plant growth
Minimizes risk of root diseases by preventing compaction and disease spores
Low heavy metals and free from clay or organic material for safe use
Environmentally friendly and sustainably produced with minimal processing
Summarized by Shop
BuildASoil Pumice Horticultural Grade: Very porous for holding air. Approximately 50% will float and 50% will sink which is ideal for soil building. Some pumice mines are also full of obsidian which is what perlite is made from and 100% will sink and not add the same air holding properties. When making potting soil, insist on horticultura
Material
Volcanic pumice stone
Color
White, Gray, Navy, Beige
Particle Size
3/8 x 1/4 inch
Recommended Use
15-40% by volume in potting soil
Sterility
Sterile, free from disease, weed seeds, and organic material
Certifications
Clean, lab-tested, no heavy metals
Summarized by Shop
4.9
304 ratings
5
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1
Fast shipping, fair prices, perfect soil amendments for the type of growing i am doing. My cactus and me couldnt be more happy. Thanks for all the help!
L
Luke · August 11, 2026
love it
does what pumice should. good quality. my citrus loves it
D
deirdre · 2 days ago
Its Pumice
Nice full bag full of quarter inch pumice. I need a few more ingredients to finish off a nice big batch of quality living soil. I am acquiring a few ingredients at a time. I love to garden and can't wait to see, and taste the quality of the organic tomatoes this soil will produce. :)
