A Method and Device for solidification of waste liquids and fluids is disclosed, which is particularly well suited to processing radioactive waste fluids. Set forth is a receiving unit or subassembly for housing solidification agent, and one or more manifold units or subassemblies positioned within the receiving unit for providing waste fluid. The subassemblies operate in relation to each other to provide, position and mix solidification agent or polymer with waste fluid so that a dirt-like polymerized waste product is produced and positioned in the container for removal or later safe shipment or storage. Mathematical relationships, in preferred embodiments or aspects are utilized in determining number and sizing of manifold openings, and pressure of waste to be provided, to meet the requirements of waste fluids to be transported through these openings into the receiving unit.