Perlite Is An Ideal Compost Additive As It Helps To Retain Air In The Compost Which Is Essential For Healthy Root Development. it Helps To Create An Optimum Balance Of Air & Water, Which Makes Water Logging Almost Impossible & Minimises Damage To Roots When Transplanting.when Added To Compost It Accelerates Rooting & Reduces The Risk Of Fungal Diseases. Perlite Is A Naturally Occurring, Non-toxic, Volcanic Rock That Has Been Heated To A High Temperature To Produce A Lightweight, Micro-porous Material With A High Surface Area. It Has Been Carefully Graded To Produce A Particle Size Of 2-5mm.uses: It Is ideal to be used When Sowing Seeds, Rooting Cuttings, Potting On & Container Growing.feeding: When Used For Root Cuttings Plants Should Be Fed As Soon As Roots Develop. When Potting On Once The Container/trough Is Fully Planted Water Well & Feed As Appropriate.application Rate: For Best Results Use At Recommended Rates.