Spindacel range are obtained by blending perlites of various granulometry and porosity with special celluloses and silica gel. Spindacel are characterized by a high apparent specific weight, which makes their use 20-30% less than that of traditional diatomaceous earths. Spindacel are completely cristobalite-free and therefore completely safe with regard to health. Spindacel R: continuous dosing aid for middle filtrations.