With thousands of installations throughout California and the world, Loprest has provided reliable, durable, and cost-effecti ... ve water treatment solutions for over 90 years. Loprest’s capabilities include: Design and manufacturing of treatment systems for 10 to 10,000 GPM Process design for the removal of numerous contaminants Pressure filters, ion exchange systems, carbon systems Controls design, manufacturing and programming Onsite filter inspection, evaluation and maintenance read more