Tetrakis (hydroxymethyl) phosphonium sulfate or Thps is a powerful broad-spectrum microbiocide used in the oilfield.

The primary use for THPS is controlling microbial growth in oilfield applications such as injection systems, drilling muds, packer fluids, completion fluids, and workover fluids.

THPS is effective in both acid and alkaline environments.  It is also fully miscible with water.

THPS is well known for being extremely effective at removing iron sulphide scale and deposits.