Reversing the water flow through the filter to remove dirt, indicated by pressure build-up across the filter.

Reversing the water flow through the filter to remove trapped debris and flush it to waste. DE filters require the addition of Diatomaceous Earth (DE) after backwashing.

reversing the flow of water through a home treatment device filter or membrane to clean and remove deposits.

Reversing the flow of water back through the filter media to remove entrapped solids.

Reversing the water flow through a sand filter to clean it. D.E. filters require reapplication of D.E. after backwashing.

To wash a filtering material upward through a softening bed. Done to cleanse material of suspended matter or dirt.