Rock Tumbler Refill Grit Media Kit | Stone Polisher | 3.5 Pounds Polishing Grits + Poly Plastic Pellets5 STEPS Just measure in the grit, add enough water to cover the stones, seal the barrel, and tumble. The only variable is how much of the product to use in your rock tumbler. We suggest 2 tbsp of grit per pound of stones, which is a good rule of thumb. COMPLETE KIT 5 Step grit pack and ceramic filler for use in 15 lb. tumbler or five 3 lb. tumbles. Coarse Grit, Medium Grit, Pre polish Grit, Grit, Polypropylene Plastic Poly Filler Pellets and