RO Chemicals Product code: RXSOL-33-3309-025 RXSOL RO-5 is a effective cleaner for colloidal iron, organic Silical or Calcium Sulphate for RO Membrane.. Request a Quote Email Us RXSOL RO-5 is a effective cleaner for colloidal iron, organic Silical or Calcium Sulphate for RO Membrane.. Application Dosage