Water associated with oil and gas retrieval becomes a disposal problem. Ways are investigated to reuse the water or dispose of it by deep well injection. Either way, suspended solids must be removed through filtration. Orival filters are capable of doing just that. Fracturing shale formations for natural gas release with a water-sand-chemical mixture (frac water) has become widespread. As the gas is brought to the surface, immense amounts of the frac water is included. Orival filters can be used to remove the sand and grit as part of the treatment process.